Create CODE_OF_CONDUCT.md

[smyrick]

Pulling from the EG open source template https://github.com/ExpediaGroup/eg-oss-parent

[codecov-io]

Codecov Report

Merging #330 into master will decrease coverage by 0.1%.
The diff coverage is n/a.

@@             Coverage Diff              @@
##             master     #330      +/-   ##
============================================
- Coverage     96.11%   96.01%   -0.11%     
  Complexity      274      274              
============================================
  Files            80       80              
  Lines           979      979              
  Branches        180      180              
============================================
- Hits            941      940       -1     
  Misses           11       11              
- Partials         27       28       +1

Impacted Files	Coverage Δ	Complexity Δ
...oup/graphql/federation/execution/EntityResolver.kt	82.6% <0%> (-4.35%)	2% <0%> (ø)

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