[Tuxpaint-i18n] Tux Paint Quickstart Guide added to tuxpaint-docs repository

[Bill K. <nb...@so...>]

I've created a "quickstart guide" for Tux Paint that briefly explains
the program's functionality in a terser and more compact way than the
full README.

My thought is, it could be something simple to hand to kids in
a classroom when they first learn how to use Tux Paint, and could
act as a reference.

It's HTML which uses PHP + gettext to allow localization.
The POT and PO files in the 'tuxpaint-docs' repo have been updated
accordingly.

There's more work I need to do, to pull out some keypress strings
(e.g., "[Ctrl]", "[Esc]", etc.), so it's still a bit of a moving
target.  I wanted to give everyone a heads-up about it before
I forgot, though. :)

On my Linux laptop running Chrome, it looks like this doc would
print out to 4 pages of US Letter paper.  It's about 1,250 words.

Thanks!

-- 
-bill!
Sent from my computer