Update README.md

Author: EduardoPires

README.md

@@ -5,6 +5,8 @@ What is the .NET DevPack.Identity?
 =====================
 .NET DevPack Identity is a set of common implementations to help you implementing ASP.NET Identity, JWT, claims validation and another facilities
 
+[![Build status](https://ci.appveyor.com/api/projects/status/e283g9ik4rk3ymsp?svg=true)](https://ci.appveyor.com/project/EduardoPires/netdevpack-identity)
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 ## Give a Star! :star:
 If you liked the project or if NetDevPack helped you, please give a star ;)