Create CODE_OF_CONDUCT.md (#15287)

Rick-Anderson · web-flow · commit 0ce5b1297244 · 2019-10-23T13:08:23.000-10:00
diff --git a/CODE_OF_CONDUCT.md b/CODE_OF_CONDUCT.md
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+# Code of Conduct
+
+This project has adopted the code of conduct defined by the Contributor Covenant
+to clarify expected behavior in our community.
+For more information, see the [.NET Foundation Code of Conduct](https://dotnetfoundation.org/code-of-conduct).
