Create CODE_OF_CONDUCT.md

[codecov[bot]]

Codecov Report

All modified and coverable lines are covered by tests :white_check_mark:

Comparison is base (f2f35ab) 76.88% compared to head (2ae963e) 76.88%.

Additional details and impacted files

```diff @@ Coverage Diff @@ ## master #516 +/- ## ======================================= Coverage 76.88% 76.88% ======================================= Files 48 48 Lines 5935 5935 ======================================= Hits 4563 4563 Misses 1372 1372 ```

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