Merge pull request #2000 from rabbitmq/contributing-update

Update contributing to include CLA and discord.

Author: MirahImage

CONTRIBUTING.md

@@ -12,7 +12,7 @@ the expected behaviour, along with repro steps when possible. It is important to
 repro when possible, as it speeds up the triage and potential fix.
 
 We do not use GitHub issues for questions or support requests. For that purpose, it is better
-to use [RabbitMQ mailing list][rmq-users] or [RabbitMQ Slack #kubernetes channel][rabbitmq-slack].
+to use [github discussions][github-discussions], the [RabbitMQ mailing list][rmq-users],  [RabbitMQ Slack #kubernetes channel][rabbitmq-slack], or [RabbitMQ Discord][rabbitmq-discord].
 
 For support questions, we strongly encourage you to provide a way to
 reproduce the behavior you're observing, or at least sharing as much
@@ -21,6 +21,10 @@ list][rmq-users]. This would include YAML manifests, Kubernetes version,
 RabbitMQ Operator logs and any other relevant information that might help
 to diagnose the problem.
 
+## Contributor License Agreement
+
+All contributors to RabbitMQ projects must sign the RabbitMQ [Contributor License Agreement][cla].
+
 ## Makefile
 
 This project contains a Makefile to perform common development operation. If you want to build, test or deploy a local copy of the repository, keep reading.
@@ -99,8 +103,10 @@ information on using pull requests.
 
 This project follows [Contributor Covenant](./CODE_OF_CONDUCT.md), version 2.0.
 
+[cla]: https://github.com/rabbitmq/cla
+[github-discussions]: https://github.com/rabbitmq/cluster-operator/discussions
 [rmq-users]: https://groups.google.com/forum/#!forum/rabbitmq-users
 [git-commit-msgs]: https://chris.beams.io/posts/git-commit/
 [github-fork]: https://help.github.com/articles/fork-a-repo/
 [rabbitmq-slack]: https://rabbitmq-slack.herokuapp.com/
-
+[rabbitmq-discord]: https://discord.com/invite/VwWnkG3GWy