Add CLAUDE.md

[gertvdw]

Add a small, concise CLAUDE.md as a start.

[sentry]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 92.33%. Comparing base (19bb02a) to head (4f30399).

Additional details and impacted files

@@           Coverage Diff           @@
##             main      #58   +/-   ##
=======================================
  Coverage   92.33%   92.33%           
=======================================
  Files          32       32           
  Lines         652      652           
  Branches       69       69           
=======================================
  Hits          602      602           
  Misses         46       46           
  Partials        4        4           

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