[REEF-1252] Improve REEF main page on Github

This change rearranges content and adds several badges
reflecting project status.

JIRA:
  [REEF-1252](https://issues.apache.org/jira/browse/REEF-1252)

Pull request:
  This closes #912

Author: tcNickolas

README.md

@@ -1,12 +1,12 @@
-[![Build Status](https://travis-ci.org/apache/reef.svg?branch=master)](https://travis-ci.org/apache/reef)
+![](website/src/site/resources/ApacheREEF_logo_no_margin_small.png)
 
 Apache REEF™
 ========================
-Apache REEF™ (Retainable Evaluator Execution Framework) is a scale-out
-computing fabric that simplifies the development of Big Data
-applications on top of resource managers (e.g., Apache YARN and
-Mesos). For example, Azure Stream Analytics is built on REEF and
-Hadoop.
+
+Apache REEF™ (Retainable Evaluator Execution Framework) is a  library for developing portable applications for 
+ cluster resource managers such as Apache Hadoop YARN or Apache
+ Mesos. For example, [Microsoft Azure Stream Analytics](https://azure.microsoft.com/en-us/services/stream-analytics/) is built on [REEF and
+Hadoop.](https://blogs.technet.microsoft.com/machinelearning/2015/12/17/reef-graduates-to-a-top-level-apache-project/) 
 
 
 Online Documentation
@@ -15,16 +15,38 @@ Detailed information on REEF can be found in the following places:
 
   * [The project website](http://reef.apache.org/)
   * [The project wiki](https://cwiki.apache.org/confluence/display/REEF/Home)
-  
+
 [The developer
-mailinglist](http://reef.apache.org/mailing-list.html) is
+mailing list](http://reef.apache.org/mailing-list.html) is
 the best way to reach REEF's developers when the above aren't
 sufficient.
 
+
+Build Status
+=============
+
+| Component | OS | Status |
+|---|:------:|:------:|
+|REEF Java | Ubuntu | [![Build Status](https://travis-ci.org/apache/reef.svg?branch=master)](https://travis-ci.org/apache/reef) |
+|REEF.NET | Windows | [![Build status](https://ci.appveyor.com/api/projects/status/qwvl6d4d8891e09d/branch/master?svg=true)](https://ci.appveyor.com/project/ApacheSoftwareFoundation/reef/branch/master) |
+
+
 Building REEF
 =============
 
 |   | Java   | .NET |
 |---|:------:|:----:|
 |Build & run unit tests| [java\BUILD.md](lang/java/BUILD.md) | [cs\BUILD.md](lang/cs/BUILD.md) |
 
+Releases
+=============
+
+[![downloads](https://img.shields.io/badge/source%20code-download-brightgreen.svg)](http://reef.apache.org/downloads.html)
+[![NuGet package](https://img.shields.io/badge/nuget-package-brightgreen.svg)](https://www.nuget.org/packages/Org.Apache.REEF.All/)
+
+License
+=============
+
+[![Apache 2.0](https://img.shields.io/badge/License-Apache%202.0-brightgreen.svg)](LICENSE)
+
+