Create CODE_OF_CONDUCT.md

[Yozhef]

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[codecov]

Codecov Report

Merging #40 (f301d1f) into develop (6ae3139) will not change coverage.
The diff coverage is n/a.

@@            Coverage Diff             @@
##             develop      #40   +/-   ##
==========================================
  Coverage      98.50%   98.50%           
  Complexity        20       20           
==========================================
  Files              8        8           
  Lines             67       67           
==========================================
  Hits              66       66           
  Misses             1        1           

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