Hey there, thanks for your consideration to contribute to this project. This is a FOSS so transperency and collaboration is number one priority.
We use github to host code, to track issues and feature requests, as well as accept pull requests.
Check the project's licence for more information, as soon as you submit a pull-request, that means you agree that the code you just wrote will fall under that licence and you won't be able to claim the code back.
We use GitHub issues to track public bugs. Report a bug by opening a new issue; it's that easy!