=doc Improve readme a bit, more links, and sections (akka#20889)

* =doc Improve readme a bit, more links, and sections

* Add link to issues

* Update README.md

* Update README.md

* Update README.md

README.md

@@ -1,6 +1,8 @@
-# Akka
+Akka
+====
 
-We believe that writing correct concurrent & distributed, resilient and elastic applications is too hard. Most of the time it's because we are using the wrong tools and the wrong level of abstraction.
+We believe that writing correct concurrent & distributed, resilient and elastic applications is too hard. 
+Most of the time it's because we are using the wrong tools and the wrong level of abstraction.
 
 Akka is here to change that.
 
@@ -10,10 +12,44 @@ For resilience we adopt the "Let it crash" model which the telecom industry has
 
 Actors also provide the abstraction for transparent distribution and the basis for truly scalable and fault-tolerant applications.
 
-Akka is Open Source and available under the Apache 2 License.
+Learn more at [akka.io](http://akka.io/).
+
+Reference Documentation
+-----------------------
+
+The reference documentation is available at [doc.akka.io](http://doc.akka.io), 
+for [Scala](http://doc.akka.io/docs/akka/current/scala.html) and [Java](http://doc.akka.io/docs/akka/current/scala.html).
+
+
+Community
+---------
+You can join these groups and chats to discuss and ask Akka related questions:
+
+- Mailing list: [![google groups: akka-user](https://img.shields.io/badge/group%3A-akka--user-blue.svg?style=flat-square)](https://groups.google.com/forum/#!forum/akka-user)
+- Chat room about *using* Akka: [![gitter: akka/akka](https://img.shields.io/badge/gitter%3A-akka%2Fakka-blue.svg?style=flat-square)](https://gitter.im/akka/akka)
+- Issue tracker: [![github: akka/akka](https://img.shields.io/badge/github%3A-issues-blue.svg?style=flat-square)](https://github.com/akka/akka/issues)
+
+In addition to that, you may enjoy following:
 
-Learn more at [akka.io](http://akka.io/). Join the [akka-user](https://groups.google.com/forum/#!forum/akka-user) mailing list. Follow [@akkateam](https://twitter.com/akkateam) on twitter.
+- The [Akka Team Blog](http://blog.akka.io)
+- [@akkateam](https://twitter.com/akkateam) on Twitter
+- Questions tagged [#akka on StackOverflow](stackoverflow.com/questions/tagged/akka)
 
-If you are looking to contribute back to Akka, the [CONTRIBUTING.md](CONTRIBUTING.md) file should provide you with all the information needed to get started. 
+Contributing
+------------
+Contributions are *very* welcome!
 
-[![Gitter](https://badges.gitter.im/Join%20Chat.svg)](https://gitter.im/akka/akka?utm_source=badge&utm_medium=badge&utm_campaign=pr-badge&utm_content=badge)
+If you see an issue that you'd like to see fixed, the best way to make it happen is to help out by submitting a PullRequest implementing it.
+
+Refer to the [CONTRIBUTING.md](https://github.com/akka/akka/blob/master/CONTRIBUTING.md) file for more details about the workflow,
+and general hints how to prepare your pull request. You can also chat ask for clarifications or guidance in github issues directly,
+or in the akka/dev chat if a more real time communication would be of benefit.
+
+A chat room is available for all questions related to *developing and contributing* to Akka:
+[![gitter: akka/dev](https://img.shields.io/badge/gitter%3A-akka%2Fdev-blue.svg?style=flat-square)](https://gitter.im/akka/dev)
+
+
+License
+-------
+
+Akka is Open Source and available under the Apache 2 License.