Update Readme.md

Add win32-build status to README.md

Readme.md

@@ -9,7 +9,8 @@ Additionally, assimp features various __mesh post processing tools__: normals an
 
 This is the development trunk containing the latest features and bugfixes. For productive use though, we recommend one of the stable releases available from [assimp.sf.net](http://assimp.sf.net) or from *nix package repositories. According to [Travis-CI] (https://travis-ci.org/), the current build status is:
 
-[![Build Status](https://travis-ci.org/assimp/assimp.png)](https://travis-ci.org/assimp/assimp)
+[![Linux Build Status](https://travis-ci.org/assimp/assimp.png)](https://travis-ci.org/assimp/assimp)
+[![Windows Build Status](https://ci.appveyor.com/api/projects/status/tmo433wax6u6cjp4?svg=true)]
 
 Coverity scan status report: <a href="https://scan.coverity.com/projects/5607">
   <img alt="Coverity Scan Build Status"