Adding a README for WS-Security demos

git-svn-id: https://svn.apache.org/repos/asf/cxf/trunk@1558824 13f79535-47bb-0310-9956-ffa450edef68
Adding a WS-SecurityPolicy version of the sign_encr sample

git-svn-id: https://svn.apache.org/repos/asf/cxf/trunk@1558825 13f79535-47bb-0310-9956-ffa450edef68