Add code of conduct

[JoshuaLampert]

In view of best practices for open-source software it's maybe good to add a code of conduct.

[JoshuaLampert]

When building the docs locally I stochastically observed a segmentation fault, which we also see in CI sometimes, e.g. here, which is really strange.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 17.80%. Comparing base (341ce08) to head (157cd29).

Additional details and impacted files

@@           Coverage Diff           @@
##             main     #118   +/-   ##
=======================================
  Coverage   17.80%   17.80%           
=======================================
  Files           3        3           
  Lines        1427     1427           
=======================================
  Hits          254      254           
  Misses       1173     1173           

Flag	Coverage Δ
unittests	17.80% <ø> (ø)

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[JoshuaLampert]

When building the docs locally I stochastically observed a segmentation fault, which we also see in CI sometimes, e.g. here, which is really strange.

I opened #119 for that.

[ranocha]

Thanks