add code of conduct

[ranocha]

No description provided.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 90.70%. Comparing base (dff0817) to head (42b7425).

Additional details and impacted files

@@           Coverage Diff           @@
##             main     #259   +/-   ##
=======================================
  Coverage   90.70%   90.70%           
=======================================
  Files          33       33           
  Lines        5112     5112           
=======================================
  Hits         4637     4637           
  Misses        475      475           

Flag	Coverage Δ
unittests	90.70% <ø> (ø)

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[coveralls]

coverage: 91.609%. remained the same
when pulling 42b7425 on hr/code_of_conduct
into dff0817 on main.