AMQNET-588 Solution clean up

- Update README file
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+# Apache.NMS: The .NET Messaging Service Client API
+For more information see http://activemq.apache.org/nms
+
+### Building
+Visual Studio 2017 or above is required to build Apache.NMS. To build, launch Visual Studio with the nms.sln file and build the solution.
+
+### Testing
+Tests use the NUnit Framework. 
+
+### Documentation 
+NMS documentation is generated automatically using [DocFX](https://dotnet.github.io/docfx/) after build. Documentation files are available under folder:
+
+`<root_directory>\docs\_site`
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-=======================================================================

-Welcome to:

- * Apache.NMS : The .NET Messaging Service Client API

-=======================================================================

-

-For more information see http://activemq.apache.org/nms

-

-=======================================================================

-Building With NAnt 0.86 see http://nant.sourceforge.net/

-=======================================================================

-

-NAnt version 0.86 or newer is required to build Apache.NMS.  Version 0.90

-or newer is highly recommended.

-To build the code using NAnt, run:

-

-  nant

-

-The NMS documentation can be generated into three different formats using

-Microsoft's Sandcastle open source product. The Sandcastle Styles project

-was used to enhance the output generated from the current release of Sandcastle.

-

-The Sandcastle project is located here:

-

-http://sandcastle.codeplex.com/

-

-The Sandcastle Styles project is located here:

-

-http://sandcastlestyles.codeplex.com/

-

-To generate the documentation, run:

-

-  nant sandcastle-all

-

-=======================================================================

-Building With Visual Studio 2008

-=======================================================================

-

-First build the project with nant, this will download and install 

-all the 3rd party dependencies for you.

-

-Open the solution File.  Build using "Build"->"Build Solution" 

-menu option.

-

-The resulting DLLs will be in build\${framework}\debug or the 

-build\${framework}\release directories depending on your settings 

-under "Build"->"Configuration Manager"

-

-If you have the Resharper plugin installed in Visual Studio, you can run 

-all the Unit Tests by using the "ReSharper"->"Unit Testing"->"Run All 

-Tests from Solution" menu option.  Please note that you must run an 

-Apache ActiveMQ Broker before kicking off the unit tests.  Otherwise,

-the standalone NUnit test runner can be used.  NUnit version 2.5.8

-is required to build and run the unit tests.

-