added sample IAM policy for cassandra
added sample IAM policy for cassandra

viafoura/buri,viafoura/buri,MarkRose/buri,MarkRose/buri,viafoura/buri,jhohertz/buri,jhohertz/buri,MarkRose/buri,Vraile/buri,inve1/buri,MarkRose/buri,inve1/buri,inve1/buri,Vraile/buri,viafoura/buri,Vraile/buri,Vraile/buri,jhohertz/buri,inve1/buri,jhohertz/buri