Community Readme: add membership information

The Community repository is where we attract and support new members, and grow contributors into climbing the membership ladder. This provides information and links to community-membership.md.

README.md

@@ -25,34 +25,22 @@ and its own mailing list, slack channel, etc.
 If you want to edit details about a SIG (e.g. its weekly meeting time or its leads),
 please follow [these instructions](./generator) that detail how our docs are auto-generated.
 
-## How Can I Help?
-
-Documentation (like the text you are reading now) can
-always use improvement!
-
-Each [kubernetes project](http://git.k8s.io) subrepository (including this one!) has issues that are labeled "help-wanted", "good first issue" or similar that should not need deep knowledge of the system. For example, here are [help wanted] issues for the main Kubernetes repository.
-
-To dig deeper, read a design doc, e.g. [architecture].
-
-[Pick a SIG](sig-list.md), peruse its associated [cmd] directory,
-find a `main()` and read code until you find something you want to fix.
-
 ## Learn to Build
 
 Links in [contributors/devel/README.md](contributors/devel/README.md)
 lead to many relevant technical topics.
 
-## Contributing
+## Contribute
 
 The [Contributor Guide](contributors/guide/README.md) provides detailed instruction on how to get your ideas and bug fixes seen and accepted, including:
 1. How to [file an issue]
 1. How to [find something to work on]
 1. How to [open a pull request]
 
+## Membership
+
+We encourage all contributors to become members. We aim to grow an active, healthy community of contributors, reviewers, and code owners. Learn more about requirements and responsibilities of memebership in our [Community Membership] page.
 
-[architecture]: /contributors/design-proposals/architecture/architecture.md
-[cmd]: https://git.k8s.io/kubernetes/cmd
-[kubernetes project]:http://git.k8s.io
 [Developer's Guide]: contributors/devel/development.md
 [Contributor Guide]:
 contributors/guide/README.md
@@ -62,9 +50,6 @@ contributors/guide/README.md
 contributors/guide/README.md#find-something-to-work-on
 [open a pull request]:
 contributors/guide/README.md#open-a-pull-request
-[develop a new feature]: https://github.com/kubernetes/features
-
-[help wanted]: https://go.k8s.io/help-wanted
-[pull request]: contributors/devel/pull-requests.md
+[Community Membership]:/community-membership.md
 
 [![Analytics](https://kubernetes-site.appspot.com/UA-36037335-10/GitHub/CONTRIBUTING.md?pixel)]()