#6 Simple tutorial with examples needed

Currently, the documentation, while a good reference, is a bit convoluted and hard to approach for new users of PyKE. A tutorial written in layman's terms using some simple (and short) examples would be helpful and make the project more approachable and easier to start using.

Also, it would be good to illustrate more the different purpose of forward vs. backward chaining rules and their relative merits as it seems they can to some extent be used interchangeably?