Merge pull request #10 from sharwell/build-status

Added AppVeyor status badge to README.md

Author: sharwell

README.md

@@ -2,4 +2,6 @@
 
 [![Join the chat at https://gitter.im/DotNetAnalyzers/AsyncUsageAnalyzers](https://badges.gitter.im/Join%20Chat.svg)](https://gitter.im/DotNetAnalyzers/AsyncUsageAnalyzers?utm_source=badge&utm_medium=badge&utm_campaign=pr-badge&utm_content=badge)
 
+[![Build status](https://ci.appveyor.com/api/projects/status/0f0w76hunsj3es8p/branch/master?svg=true)](https://ci.appveyor.com/project/sharwell/asyncusageanalyzers/branch/master)
+
 This repository contains analyzers for best practices related to asynchronous programming. Where possible, code fixes are also provided to simplify the process of correcting violations.