readme: link to CoC from main readme and contributing guide

Uses the same text as the top-level CONTRIBUTING file.

Signed-off-by: Paul Jolly <[email protected]>
Change-Id: I201164b87e99b35e7a18a77efe6e5dabae1fed53
Reviewed-on: https://review.gerrithub.io/c/cue-lang/cue/+/520754

Author: myitcv

README.md

@@ -157,7 +157,14 @@ To report issues or make a feature request, use the
 Changes can be contributed using Gerrit or Github pull requests.
 
 
-### Contact
+## Code of Conduct
+
+Guidelines for participating in CUE community spaces and a reporting process for
+handling issues can be found in the [Code of
+Conduct](https://cuelang.org/docs/contribution_guidelines/conduct).
+
+
+## Contact
 
 You can get in touch with the cuelang community in the following ways:
 

doc/contribute.md

@@ -980,3 +980,8 @@ $ git codereview mail HEAD
 Make sure to explicitly specify `HEAD`, which is usually not required when sending
 single changes.
 
+## Code of Conduct
+
+Guidelines for participating in CUE community spaces and a reporting process for
+handling issues can be found in the [Code of
+Conduct](https://cuelang.org/docs/contribution_guidelines/conduct).