add readme desc

git-svn-id: https://plugins.svn.wordpress.org/asgard/trunk@1007611 b8457f37-d9ea-0310-8a92-e5e31aec5664
change

git-svn-id: https://plugins.svn.wordpress.org/asgard/trunk@1007612 b8457f37-d9ea-0310-8a92-e5e31aec5664