Update README with badges.

Author: jkoritzinsky

README.md

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 # SharpGen.Doc.Msdn
 
+[![Build status](https://ci.appveyor.com/api/projects/status/v5p50y04otj01f7g/branch/master?svg=true)](https://ci.appveyor.com/project/jkoritzinsky/sharpgen-doc-msdn/branch/master)  [![MyGet Pre Release](https://img.shields.io/myget/sharpgentools/vpre/SharpGen.Doc.Msdn.svg)](https://www.myget.org/feed/Packages/sharpgentools) [![NuGet](https://img.shields.io/nuget/v/SharpGen.Doc.Msdn.svg)](https://www.nuget.org/packages/SharpGen.Doc.Msdn.Tasks)
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 MSDN Documentation Provider for SharpGen and SharpGenTools.Sdk.