added disclaimer

README.md

@@ -8,6 +8,12 @@ Features:
 - Sets up initial flow.xml.gz that sets up Ambari reporting task to send Ambari metrics
 - Includes metrics widgets from [here](https://cwiki.apache.org/confluence/display/NIFI/Ambari+Metrics)
 
+Limitations:
+
+- This is not an officially supported service and *is not meant to be deployed in production systems*. It is only meant for testing demo/purposes
+- It does not support Ambari/HDP upgrade process and will cause upgrade problems if not removed prior to upgrade
+- Not tested on secured clusters
+
 Authors: 
   - [Ali Bajwa](https://github.com/abajwa-hw): Nifi Install/start/stop via Ambari
   - [Bryan Bende](https://github.com/bbende): Ambari metrics integration