Update README.md

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@@ -9,6 +9,8 @@ Compatible with Microsoft Authenticator for Windows Phone, and Google Authentica
 
 You can use this library as well for a client application (if you want to create your own authenticator) or for a server application (add two-step authentication on your asp.net website)
 
+![Build status](https://glacasa.visualstudio.com/DefaultCollection/_apis/public/build/definitions/ab4c93fc-5d51-44a7-b9e5-fcd42fbb9bc3/7/badge)
+
 # TOTP
 
 ## Client usage
@@ -59,4 +61,4 @@ var authenticator = new TwoStepsAuthenticator.TimeAuthenticator(usedCodeManager)
 
 And when you check if the code is ok, you need to add the user object to the CheckCode method
 <pre><code>bool isok = authenticator.CheckCode(secret, code, user);
-</code></pre>
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+</code></pre>