added code of conduct

as requested by Facebook OSS program.

diff --git a/CODE_OF_CONDUCT.md b/CODE_OF_CONDUCT.md
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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.fb.com/codeofconduct/)
+so that you can understand what actions will and will not be tolerated.