replace readme

git-svn-id: https://plugins.svn.wordpress.org/cm-onboarding/trunk@1050382 b8457f37-d9ea-0310-8a92-e5e31aec5664
update read

git-svn-id: https://plugins.svn.wordpress.org/cm-onboarding/trunk@1050383 b8457f37-d9ea-0310-8a92-e5e31aec5664