Added appveyor icon

Author: eswann

README.md

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 # ClearScript.Manager
 
+[![Build status](https://ci.appveyor.com/api/projects/status/b43oj4a3ccj7fm31?svg=true)](https://ci.appveyor.com/project/eswann/clearscript-manager)
+
 ClearScript Manager was created to encapsulate the use of the ClearScript V8 engine in multi-use scenarios, like in a hosted server project (Ex: for use in a Web App or Web API).
 
 ClearScript is an awesome library that was created to allow execution of JavaScript via V8 from the .Net runtime.