Add Code of Conduct (#1273)
Add Code of Conduct (#1273)

Summary:
Adds FB standard CoC
Pull Request resolved: https://github.com/Instagram/IGListKit/pull/1273

Differential Revision: D12844305

Pulled By: rnystrom

fbshipit-source-id: c1eda7ce660baecbcb9dc48ea4d6865302ebbacc

Instagram/IGListKit,Instagram/IGListKit,Instagram/IGListKit,Instagram/IGListKit,Instagram/IGListKit