Create CODE_OF_CONDUCT.md

[TomWFox]

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[codecov]

Codecov Report

Merging #101 into master will not change coverage.
The diff coverage is n/a.

@@            Coverage Diff            @@
##             master     #101   +/-   ##
=========================================
  Coverage     72.35%   72.35%           
  Complexity       84       84           
=========================================
  Files            11       11           
  Lines           369      369           
  Branches         24       24           
=========================================
  Hits            267      267           
  Misses           86       86           
  Partials         16       16

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