Merge pull request #2922 from weaveworks/coc

Add code-of-conduct.md pointing to CNCF CoC

code-of-conduct.md

@@ -0,0 +1,7 @@
+## Community Code of Conduct
+
+Weaveworks 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 Weaveworks project maintainer, or
+Alexis Richardson alexis@weave.works.