Update readme

README

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-Project to house RHQ plugins for GateIn.
+GateIn RHQ
+=============
+
+Project to house RHQ Plugins for [GateIn Portal](http://gatein.org)
+
+Installation
+-----------
+
+`mvn clean install`
+
+Then copy the jar to the RHQ server plugins directory. Have a look at [GateIn RHQ How-To](https://community.jboss.org/wiki/EPPJONRHQPluginHow-to)
+for more information on getting started with this plugin and RHQ.
+
+Also documentation on how to use the plugin within RHQ can be found [here](https://docs.jboss.org/author/display/GTNPORTAL34/Administration+and+Monitoring)
+
+Compatible Portal Platforms
+-----------
+* GateIn 3.4 running on AS5 or AS6
+* EPP 5.2.x
+
+Compatible RHQ Servers
+-----------
+* RHQ 4.2.x
+