Create CODE_OF_CONDUCT.md

[ayangromano]

for issue bionode/bionode#38

[codecov-io]

Codecov Report

Merging #52 into master will not change coverage.
The diff coverage is n/a.

@@           Coverage Diff           @@
##           master      #52   +/-   ##
=======================================
  Coverage   80.64%   80.64%           
=======================================
  Files          36       36           
  Lines         806      806           
  Branches       99       99           
=======================================
  Hits          650      650           
  Misses        156      156

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[bmpvieira]

👍