Update README.md

Author: ethanhann

README.md

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 #IntegrationEngine
 
 [Project Site](http://inengine.net/)
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+![NuGet Downloads](https://img.shields.io/nuget/dt/IntegrationEngine.svg?style=flat-square)
+![AppVeyor Master](https://ci.appveyor.com/api/projects/status/github/ethanhann/inengine.net?branch=master&svg=true&passingText=master%20-%20OK)
+![AppVeyor Develop](https://ci.appveyor.com/api/projects/status/github/ethanhann/inengine.net?branch=develop&svg=true&passingText=develop%20-%20OK)
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