Create CODE_OF_CONDUCT.md

[jmbhughes]

• add code of conduct

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 0.00%. Comparing base (47e6ef0) to head (0a2a1c6).
Report is 3 commits behind head on mh-improve-warm-start.

Additional details and impacted files

@@                  Coverage Diff                  @@
##           mh-improve-warm-start     #25   +/-   ##
=====================================================
  Coverage                   0.00%   0.00%           
=====================================================
  Files                         18      18           
  Lines                       1867    1867           
  Branches                     282     278    -4     
=====================================================
- Misses                      1862    1867    +5     
+ Partials                       5       0    -5     

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