I'm really glad you're reading this, thanks for taking the time to contribute! :)
You are free to add new features, report bugs or add any kind of documentation.
Please do not forget about these:
We have a custom Checkstyle ruleset ready, so whenever adding new code, do not forget to run the checks! :)
Make sure you always have an issue and you applied and got accepted to work on that particular thing
If you change or add something make sure that you added at least a few lines of docs
Make sure to add test cases! :)