add some basic documentation

[tdixon97]

No description provided.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 77.71%. Comparing base (ad7b135) to head (c61df21).
Report is 15 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main      #54      +/-   ##
==========================================
- Coverage   77.86%   77.71%   -0.15%     
==========================================
  Files          16       15       -1     
  Lines         768      763       -5     
==========================================
- Hits          598      593       -5     
  Misses        170      170              

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[ManuelHu]

I addressed the two outstanding open issues from my review, and also some other things that changed in the mean time (i.e. pygeom-l200 no longer being private).

Even though this is still very simple, I think this can be merged @gipert @tdixon97 ?

[gipert]

I would like to review it.

Also I would convert to markdown and enable the prettier pre-commit hook.

[ManuelHu]

prettier is enabled, but just does not work on rst files...