Hurray! We are glad that you want to contribute to our project! 💖
If you see an issue that you'd like to work on, please just post a comment saying that you want to work on it. Something like "I want to work on this" is fine.
If you decide to contribute (we hope you do 😄), the process is familiar and easy if you've used Github before. There are no long documents to read or complex setup. If you haven't used Github before, the awesome @bketelsen has created a good overview on how to contribute code - see here.