Add CODE_OF_CONDUCT.md

[tpvasconcelos]

Publish an official Code of Conduct

[codecov-commenter]

Codecov Report

Merging #7 (d8c9e1a) into master (5c556ba) will not change coverage.
The diff coverage is n/a.

❗ Current head d8c9e1a differs from pull request most recent head 8f59e02. Consider uploading reports for the commit 8f59e02 to get more accurate results

@@           Coverage Diff           @@
##           master       #7   +/-   ##
=======================================
  Coverage   29.77%   29.77%           
=======================================
  Files           7        7           
  Lines         178      178           
=======================================
  Hits           53       53           
  Misses        125      125           

Flag	Coverage Δ
unittests	29.77% <ø> (ø)

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