Add an explicit link to Code of Conduct (#3781)

All FB open source projects including this one enforce [our code of conduct](https://code.facebook.com/pages/876921332402685/open-source-code-of-conduct), but I just realized we haven't explicitly linked to it from a Markdown file. So I'm doing just that.
facebook · Jan 14, 2018 · a3d33c4 · a3d33c4
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+# Code of Conduct
+
+Facebook has adopted a Code of Conduct that we expect project participants to adhere to. Please [read the full text](https://code.facebook.com/pages/876921332402685/open-source-code-of-conduct) so that you can understand what actions will and will not be tolerated.