First and foremost, thanks a lot for the interest in contributing to this little project. We really appreciate that.
Your first stop is the development documentation. It will explain how the source code is organised, and how packages — the fundamental module unit of Patchfox — work.
The issue tracker lists all fixes and enhancements that are currently on track. Feel free to browse them and reach out if you'd like to help with any specific issue. Also, don't be discouraged from playing with the code and working on something that is not on the issue list.
The best way to contact me regarding Patchfox development is by posting a message in the #patchfox
channel using SSB.