Update readme.md

readme.md

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 # Callisto
 
+[![Build status](http://ci.appveyor.com/api/projects/status/cibx2vk3h5fr53t7)](http://ci.appveyor.com/project/TimHeuer/callisto)
+
 ## What Is It?
 
 Callisto is a library for use in Windows Store XAML applications (aka Metro style apps).  The XAML framework in Windows.UI.Xaml is great, but has some functionality that isn't provided in-the-box in a few controls and APIs.  Callisto provides added functionality on top of the XAML UI framework for Windows.
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 Some of the code represented in the toolkit is forks/ports of other Open Source libraries.  Where used, their license is reprsented in the code files.
 
 * [Silverlight Toolkit](http://silverlight.codeplex.com) - for providing the base of many ported concepts/code.  Licensed under Ms-PL
-* [RestSharp](http://restsharp.org) - the OAuth helper file is a fork from the RestSharp project which uses this internally for some authenticators. Licensed under Apache 2.0
+* [RestSharp](http://restsharp.org) - the OAuth helper file is a fork from the RestSharp project which uses this internally for some authenticators. Licensed under Apache 2.0