feat: add code of conduct

[mrjoelkamp]

Summary

• adds code of conduct

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 66.37%. Comparing base (85cf56d) to head (c7b2ebe).
Report is 2 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##             main     #206   +/-   ##
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  Coverage   66.37%   66.37%           
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  Files          44       44           
  Lines        3215     3215           
=======================================
  Hits         2134     2134           
  Misses        779      779           
  Partials      302      302           

Flag	Coverage Δ
unittests	66.37% <ø> (ø)

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[jonnystoten]

LGTM, but the CoC in that repo looks more geared towards physical events, especially DockerCon. We should update it to make sure it works for our open-source projects.

[jonnystoten]

Ha, I was about to open an issue on that repo but found this one from @tianon-sso:

• Generic? code-of-conduct#34

Perhaps we should just use https://www.contributor-covenant.org/ as suggested there