Added notes about the extension

ExtensionNotes.md

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+ServiceStackVS
+==========
+
+ServiceStackVS is a Visual Studio extension to be used along side the ServiceStack framework.
+
+Installation
+------------
+ServiceStackVS is packaged as a VSIX and is available the Visual Studio Gallery or from this repository.
+
+ServiceStackVS supports **Visual Studio 2012**, however it does **require the installation of the [following patch](http://www.microsoft.com/en-au/download/details.aspx?id=40764)** as well as IE10 or above.
+
+Templates
+---------
+
+Project templates included in the extension:
+
+- ServiceStack ASP.NET Empty
+- ServiceStack ASP.NET MVC5
+- ServiceStack ASP.NET with AngularJS
+- ServiceStack ASP.NET with Bootstrap
+- ServiceStack ASp.NET with Razor
+- ServiceStack Self Host Empty
+
+These project templates are structured to encourage patterns to help kickstart your new ServiceStack application.
+
+![](https://raw.githubusercontent.com/ServiceStack/ServiceStackVS/master/servicestackvs-templates.gif)