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+<!-- This Source Code Form is subject to the terms of the Mozilla Public
+   - License, v. 2.0. If a copy of the MPL was not distributed with this
+   - file, You can obtain one at http://mozilla.org/MPL/2.0/. -->
+
+#Getting Started
+The contribution process consists of a number of steps. First, you need to get
+a copy of the code. Next, you need to open a bug for the bug or feature you want
+to work on, and assign it to yourself. Alternatively, you can take an existing
+bug to work on. Once you've taken a bug, you can start writing a patch. Once
+your patch is complete, you've made sure it doesn't break any tests, and you've
+gotten a positive review for it, the last step is to request for your patch to
+be merged with the main codebase.
+
+Although these individual steps are all obvious, there are quite some details
+involved. The rest of this article will cover each individual step of the
+contribution process in more detail.
+
+##Getting the Code
+The Add-on SDK code is hosted on GitHub. GitHub is a web-based hosting service
+for software projects that is based on Git, a distributed version control
+system. Both GitHub and Git are an integral part of our workflow. If you haven't
+familiarized yourself with Git before, I strongly suggest you do so now. You're
+free to ignore that suggestion if you want, but it's going to hurt you later on
+(don't come crying to me if you end up accidentally detaching your head, for
+instance). A full explanation of how to use Git is out of scope for this
+document, but a very good one
+[can be found online here](http://git-scm.com/book). Reading at least sections
+1-3 from that book should be enough to get you started.
+
+If you're already familiar with Git, or if you decided to ignore my advice and
+jump right in, the following steps will get you a local copy of the Add-on SDK
+code on your machine:
+
+1. Fork the SDK repository to your GitHub account
+2. Clone the forked repository to your machine
+
+A fork is similar to a clone in that it creates a complete copy of a repository,
+including the history of every file. The difference is that a fork copies the
+repository to your GitHub account, whereas a clone copies it to your machine. To
+create a fork of the SDK repository, you need a GitHub account. If you don't
+already have one, you can [create one here](https://github.com/) (don't worry:
+it's free!). Once you got yourself an account, go to
+[the Add-on SDK repository](https://github.com/mozilla/addon-sdk), and click the
+fork button in the upper-right corner. This will start the forking process.
+This could take anywhere between a couple of seconds and a couple of minutes.
+
+Once the forking process is complete, the forked repository will be available at
+https://github.com/\<your-username\>/addon-sdk. To create a clone of the this
+repository, you need to have Git installed on your machine. If you don���t have it
+already, you can [download it here](http://git-scm.com/). Once you have Git
+installed (make sure you also configured your name and e-mail
+address), open your terminal, and enter the following command from the directory
+where you want to have the clone stored:
+
+> `git clone ssh://github.com/<your-username>/addon-sdk`
+
+This will start the cloning process. Like the forking process, this could take
+anywhere between a couple of seconds and a couple of minutes, depending on the
+speed of your connection.
+
+If you did everything correctly so far, once the cloning process is complete,
+the cloned repository will have been stored inside the directory from which you
+ran the clone command, in a new directory called addon-sdk. Now we can start
+working with it. Yay!
+
+As a final note: it is possible to skip step 1, and clone the SDK repository
+directly to your machine. This is useful if you only want to study the SDK code.
+However, if your goal is to actually contribute to the SDK, skipping step 1 is a
+bad idea, because you won���t be able to make pull requests in that case.
+
+##Opening a Bug
+In any large software project, keeping track of bugs is crucially important.
+Without it, developers wouldn't be able to answer questions such as: what do I
+need to work on, who is working on what, etc. Mozilla uses its own web-based,
+general-purpose bugtracker, called Bugzilla, to keep track of bugs. Like GitHub
+and Git, Bugzilla is an integral part of our workflow. When you discover a new
+bug, or want to implement a new feature, you start by creating an entry for it
+in Bugzilla. By doing so, you give the SDK team a chance to confirm whether your
+bug isn't actually a feature, or your feature isn't actually a bug
+(that is, a feature we feel doesn't belong into the SDK).
+
+Within Bugzilla, the term _bug_ is often used interchangably to refer to both
+bugs and features. Similarly, the Bugzilla entry for a bug is also named bug,
+and the process of creating it is known as _opening a bug_. It is important that
+you understand this terminology, as other people will regularly refer to it.
+
+I really urge you to open a bug first and wait for it to get confirmed before
+you start working on something. Nothing sucks more than your patch getting
+rejected because we felt it shouldn't go into the SDK. Having this discussion
+first saves you from doing useless work. If you have questions about a bug, but
+don't know who to ask (or the person you need to ask isn't online), Bugzilla is
+the communication channel of choice. When you open a bug, the relevant people
+are automatically put on the cc-list, so they will get an e-mail every time you
+write a comment in the bug.
+
+To open a bug, you need a Bugzilla account. If you don't already have one, you
+can [create it here](https://bugzilla.mozilla.org/). Once you got yourself an
+account, click the "new" link in the upper-left corner. This will take you to a
+page where you need to select the product that is affected by your bug. It isn't
+immediately obvious what you should pick here (and with not immediately obvious
+I mean completely non-obvious), so I'll just point it out to you: as you might
+expect, the Add-on SDK is listed under "Other products", at the bottom of the
+page.
+
+After selecting the Add-on SDK, you will be taken to another page, where you
+need to fill out the details for the bug. The important fields are the component
+affected by this bug, the summary, and a short description of the bug (don't
+worry about coming up with the perfect description for your bug. If something is
+not clear, someone from the SDK team will simply write a comment asking for
+clarification). The other fields are optional, and you can leave them as is, if
+you so desire.
+
+Note that when you fill out the summary field, Bugzilla automatically looks for
+bugs that are possible duplicates of the one you're creating. If you spot such a
+duplicate, there's no need to create another bug. In fact, doing so is
+pointless, as duplicate bugs are almost always immediately closed. Don't worry
+about accidentally opening a duplicate bug though. Doing so is not considered a
+major offense (unless you do it on purpose, of course).
+
+After filling out the details for the bug, the final step is to click the
+"Submit Bug" button at the bottom of the page. Once you click this button, the
+bug will be stored in Bugzilla���s database, and the creation process is
+completed. The initial status of your bug will be `UNCONFIRMED`. All you need to
+do now is wait for someone from the SDK team to change the status to either
+`NEW` or `WONTFIX`.
+
+##Taking a Bug
+Since this is a contributor's guide, I've assumed until now that if you opened a
+bug, you did so with the intention of fixing it. Simply because you're the one
+that opened it doesn't mean you have to fix a bug, however. Conversely, simply
+because you're _not_ the one that opened it doesn't mean you can't fix a bug. In
+fact, you can work on any bug you like, provided nobody else is already working
+on it. To check if somebody is already working on a bug, go to the entry for
+that bug and check the "Assigned To" field. If it says "Nobody; OK to take it
+and work on it", you're good to go: you can assign the bug to yourself by
+clicking on "(take)" right next to it.
+
+Keep in mind that taking a bug to creates the expectation that you will work on
+it. It's perfectly ok to take your time, but if this is the first bug you're
+working on, you might want to make sure that this isn't something that has very
+high priority for the SDK team. You can do so by checking the importance field
+on the bug page (P1 is the highest priority). If you've assigned a bug to
+yourself that looked easy at the time, but turns out to be too hard for you to
+fix, don't feel bad! It happens to all of us. Just remove yourself as the
+assignee for the bug, and write a comment explaining why you're no longer able
+to work on it, so somebody else can take a shot at it.
+
+A word of warning: taking a bug that is already assigned to someone else is
+considered extremely rude. Just imagine yourself working hard on a series of
+patches, when suddenly this jerk comes out of nowhere and submits his own
+patches for the bug. Not only is doing so an inefficient use of time, it also
+shows a lack of respect for other the hard work of other contributors. The other
+side of the coin is that contributors do get busy every now and then, so if you
+stumble upon a bug that is already assigned to someone else but hasn't shown any
+activity lately, chances are the person to which the bug is assigned will gladly
+let you take it off his/her hands. The general rule is to always ask the person
+assigned to the bug if it is ok for you to take it.
+
+As a final note, if you're not sure what bug to work on, or having a hard time
+finding a bug you think you can handle, a useful tip is to search for the term
+"good first bug". Bugs that are particularly easy, or are particularly well
+suited to familiarize yourself with the SDK, are often given this label by the
+SDK team when they're opened.
+
+##Writing a Patch
+Once you've taken a bug, you're ready to start doing what you really want to do:
+writing some code. The changes introduced by your code are known as a patch.
+Your goal, of course, is to get this patch landed in the main SDK repository. In
+case you aren't familiar with git, the following command will cause it to
+generate a diff:
+
+> `git diff`
+
+A diff describes all the changes introduced by your patch. These changes are not
+yet final, since they are not yet stored in the repository. Once your patch is
+complete, you can _commit_ it to the repository by writing:
+
+> `git commit`
+
+After pressing enter, you will be prompted for a commit message. What goes in
+the commit message is more or less up to you, but you should at least include
+the bug number and a short summary (usually a single line) of what the patch
+does. This makes it easier to find your commit later on.
+
+It is considered good manners to write your code in the same style as the rest
+of a file. It doesn't really matter what coding style you use, as long as it's
+consistent. The SDK might not always use the exact same coding style for each
+file, but it strives to be as consistent as possible. Having said that: if
+you're not completely sure what coding style to use, just pick something and
+don't worry about it. If the rest of the file doesn't make it clear what you
+should do, it most likely doesn't matter.
+
+##Making a Pull Request
+To submit a patch for review, you need to make a pull request. Basically, a pull
+request is a way of saying: "Hey, I've created this awesome patch on top of my
+fork of the SDK repository, could you please merge it with the global 
+repository?". GitHub has built-in support for pull requests. However, you can
+only make pull requests from repositories on your GitHub account, not from
+repositories on your local machine. This is why I told you to fork the SDK
+repository to your GitHub account first (you did listen to me, didn't you?).
+
+In the previous section, you commited your patch to your local repository, so
+here, the next step is to synchronize your local repository with the remote one,
+by writing:
+
+> `git push`
+
+This pushes the changes from your local repository into the remote repository.
+As you might have guessed, a push is the opposite of a pull, where somebody else
+pulls changes from a remote repository into their own repository (hence the term
+'pull request'). After pressing enter, GitHub will prompt you for your username
+and password before actually allowing the push.
+
+If you did everything correctly up until this point, your patch should now show
+up in your remote repository (take a look at your repository on GitHub to make
+sure). We're now ready to make a pull request. To do so, go to your repository
+on GitHub and click the "Pull Request" button at the top of the page. This will
+take you to a new page, where you need to fill out the title of your pull
+request, as well as a short description of what the patch does. As we said
+before, it is common practice to at least include the bug number and a short
+summary in the title. After you've filled in both fields, click the "Send Pull
+Request" button.
+
+That's it, we're done! Or are we? This is software development after all, so
+we'd expect there to be at least one redundant step. Luckily, there is such a
+step, because we also have to submit our patch for review on Bugzilla. I imagine
+you might be wondering to yourself right now: "WHY???". Let me try to explain.
+The reason we have this extra step is that most Mozilla projects use Mercurial
+and Bugzilla as their version control and project management tool, respectively.
+To stay consistent with the rest of Mozilla, we provide a Mercurial mirror of
+our Git repository, and submit our patches for review in both GitHub and
+Bugzilla.
+
+If that doesn't make any sense to you, that's ok: it doesn't to me, either. The
+good news, however, is that you don't have to redo all the work you just did.
+Normally, when you want to submit a patch for review on Bugzilla, you have to
+create a diff for the patch and add it as an attachment to the bug (if you still
+haven't opened one, this would be the time to do it). However, these changes are
+also described by the commit of your patch, so its sufficient to attach a file
+that links to the pull request. To find the link to your pull request, go to
+your GitHub account and click the "Pull Requests" button at the top. This will
+take you to a list of your active pull requests. You can use the template here
+below as your attachment. Simply copy the link to your pull request, and use it
+to replace all instances of \<YOUR_LINK_HERE\>:
+
+    <!DOCTYPE html>
+    <meta charset="utf-8">
+    <meta http-equiv="refresh" content="<YOUR_LINK_HERE>">
+    <title>Bugzilla Code Review</title>
+    <p>You can review this patch at <a href="<YOUR_LINK_HERE >"><YOUR_LINK_HERE></a>,
+    or wait 5 seconds to be redirected there automatically.</p>
+
+Finally, to add the attachment to the bug, go to the bug in Bugzilla, and click
+on "Add an attachment" right above the comments. Make sure you fill out a
+description for the attachment, and to set the review flag to '?' (you can find
+a list of reviewers on
+[this page](https://github.com/mozilla/addon-sdk/wiki/contribute)). The '?' here
+means that you're making a request. If your patch gets a positive review, the
+reviewer will set this flag to '+'. Otherwise, he/she will set it to '-', with
+some feedback on why your patch got rejected. Of course, since we also use
+GitHub for our review process, you're most likely to get your feedback there,
+instead of Bugzilla. If your patch didn't get a positive review right away,
+don't sweat it. If you waited for your bug to get confirmed before submitting
+your patch, you'll usually only have to change a few small things to get a
+positive review for your next attempt. Once your patch gets a positive review,
+you don't need to do anything else. Since you did a pull request, it will
+automatically be merged into the remote repository, usually by the person that
+reviewed your patch.
+
+##Getting Additional Help
+If something in this article wasn't clear to you, or if you need additional
+help, the best place to go is irc. Mozilla relies heavily on irc for direct
+communication between contributors. The SDK team hangs out on the #jetpack
+channel on the irc.mozilla.org server (Jetpack was the original name of the
+SDK, in case you're wondering).
+
+Unless you are know what you are doing, it can be hard to get the information
+you need from irc, uso here are a few useful tips:
+
+* Mozilla is a global organization, with contributors all over the world, so the
+  people you are trying to reach are likely not in the same timezone as you.
+  Most contributors to the SDK are currently based in the US, so if you're in
+  Europe, and asking a question on irc in the early afternoon, you're not likely
+  to get many replies.
+
+* Most members of the SDK team are also Mozilla employees, which means they're
+  often busy doing other stuff. That doesn't mean they don't want to help you.
+  On the contrary: Mozilla encourages employees to help out contributors
+  whenever they can. But it does mean that we're sometimes busy doing other
+  things than checking irc, so your question may go unnoticed. If that happens,
+  the best course of action is often to just ask again.
+
+* If you direct your question to a specific person, rather than the entire
+  channel, your chances of getting an answer are a lot better. If you prefix
+  your message with that person's irc name, he/she will get a notification in
+  his irc client. Try to make sure that the person you're asking is actually the
+  one you need, though. Don't just ask random questions to random persons in the
+  hopes you'll get more response that way.
+
+* If you're not familiar with irc, a common idiom is to send someone a message
+  saying "ping" to ask if that person is there. When that person actually shows
+  up and sees the ping, he will send you a message back saying "pong". Cute,
+  isn't it? But hey, it works.
+
+* Even if someone does end up answering your questions, it can happen that that
+  person gets distracted by some other task and forget he/she was talking to
+  you. Please don't take that as a sign we don't care about your questions. We
+  do, but we too get busy sometimes: we're only human. If you were talking to
+  somebody and haven't gotten any reply to your last message for some time, feel
+  free to just ask again.
+
+* If you've decided to pick up a good first bug, you can (in theory at least)
+  get someone from the SDK team to mentor you. A mentor is someone who is
+  already familiar with the code who can walk you through it, and who is your go
+  to guy in case you have any questions about it. The idea of mentoring was
+  introduced a while ago to make it easier for new contributors to familiarize
+  themselves with the code. Unfortunately, it hasn't really caught on yet, but
+  we're trying to change that. So by all means: ask!