code-of-conduct.md: link to CNCF code of conduct and add contact info (#11)

Author: Eric Stroczynski

code-of-conduct.md

@@ -0,0 +1,6 @@
+# Operator Framework Community Code of Conduct
+
+Operator Framework follows the [CNCF Code of Conduct](https://github.com/cncf/foundation/blob/master/code-of-conduct.md).
+
+Instances of abusive, harassing, or otherwise unacceptable behavior may be reported by contacting
+a [community chair](./GOVERNANCE.md#operations) or the CNCF mediator noted in the code of conduct document linked above.