Add build badge

Author: hzalaz

README.md

@@ -1,5 +1,7 @@
 # Auth0 Java
 
+[![Build status][travis-ci-badge]](travis-ci-url)
+
 Java client library for the [Auth0](https://auth0.com) platform.
 
 ## Download
@@ -114,4 +116,10 @@ If you have found a bug or if you have a feature request, please report them at
 
 ## License
 
-This project is licensed under the MIT license. See the [LICENSE](LICENSE) file for more info.
+This project is licensed under the MIT license. See the [LICENSE](LICENSE) file for more info.
+
+
+<!-- Vars -->
+
+[travis-ci-badge]: https://travis-ci.org/auth0/auth0-api-java.svg?branch=master
+[tavis-ci-url]: https://travis-ci.org/auth0/auth0-api-java