Update README.MD

Author: Layoric

src/ServiceStackIDEA/README.MD

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+## ServiceStackIDEA now for IntelliJ and Maven
+
+The ServiceStackIDEA plugin as been expanded to support IntelliJ and Maven projects as well as Android Studio and Gradle. This gives Java developers a familar experience when writing clients for ServiceStack in Android and any other Java client.
+
+![](https://github.com/ServiceStack/Assets/raw/master/img/servicestackidea/ss-addref-maven-intellij-osx.gif)
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 ## AndroidStudio ServiceStack Plugin
 
 ServiceStackIDEA is a plugin for AndroidStudio to make working with ServiceStack services easier when building Android apps.