If you want to contribute: Great, Thank you!
Contributions can have many faces. If you just found a Bug or a Glitch in the documentation and want to report it: use the issue tracker of this project and preport your finding. We will do our best to help you.
If you want to give feedback and ideas, then also the issue tracker is the place to put it. We will discuss it there and see if and how its possible.
To actually contribute code, fix bugs or improve the documentation, you can fork the repositioy, make your changes and provide a PullRequest back. We try to review and merge all contributions as soon as possible. To keep things readable, please format all your code according to the LLVM code style. The easiest way to achieve this is to use the clang-format tool. Just run it over your code before you commit:
$ clang-format -style=LLVM -i <filename>