Create CODE_OF_CONDUCT.md

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Codecov Report

Merging #22 (6345fde) into master (1df9610) will not change coverage.
The diff coverage is n/a.

@@           Coverage Diff           @@
##           master      #22   +/-   ##
=======================================
  Coverage   99.42%   99.42%           
=======================================
  Files           3        3           
  Lines         174      174           
=======================================
  Hits          173      173           
  Misses          1        1           

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