Update README.md

Author: Eugen

spring-security-rest-full/README.md

@@ -10,6 +10,7 @@
 - [REST API Discoverability and HATEOAS](http://www.baeldung.com/2011/11/06/restful-web-service-discoverability-part-4/)
 - [ETags for REST with Spring](http://www.baeldung.com/2013/01/11/etags-for-rest-with-spring/)
 - [Error Handling for REST with Spring 3](http://www.baeldung.com/2013/01/31/exception-handling-for-rest-with-spring-3-2/)
+- [Integration Testing with the Maven Cargo plugin](http://www.baeldung.com/2011/10/16/how-to-set-up-integration-testing-with-the-maven-cargo-plugin/)
 
 
 ### Build the Project