Enhance readme

git-svn-id: https://plugins.svn.wordpress.org/wpml-to-multilingualpress/trunk@1014318 b8457f37-d9ea-0310-8a92-e5e31aec5664
Enhance readme

git-svn-id: https://plugins.svn.wordpress.org/wpml-to-multilingualpress/trunk@1014321 b8457f37-d9ea-0310-8a92-e5e31aec5664