Adding the QoS Model (future  can add a maven plugin)

git-svn-id: https://svn.wso2.org/repos/wso2/trunk/tools@193070 a5903396-d722-0410-b921-86c7d4935375
Adding the schemas associate with QoS model

git-svn-id: https://svn.wso2.org/repos/wso2/trunk/tools@193072 a5903396-d722-0410-b921-86c7d4935375