Hello, and welcome to MDAnalysis!
MDAnalysis is a Python package for the analysis trajectories from molecular dynamic simulations. If you haven't used MDAnalysis before, the first step would be to learn a bit more about the package and how it works. You can find a lot of learning material here:
In particular the User Guide contains a lot of interesting information about MDAnalysis:
If you are already familiar with MDAnalysis you can have a look at the "Contributing to MDAnalysis" section of the user guide, which will explain how to contribute to the MDAnalysis codebase (or the user guide itself):
I hope this is enough to get you started, but do not hesitate to reach out if you have further questions (here, on other MDAnalysis mailing lists, or on Discord).
Best,
Rocco