Deleted old README.md

git-svn-id: https://plugins.svn.wordpress.org/adplugg/trunk@835566 b8457f37-d9ea-0310-8a92-e5e31aec5664
Merge branch 'master' of https://github.com/adplugg/wordpress-ad-plugin

git-svn-id: https://plugins.svn.wordpress.org/adplugg/trunk@835567 b8457f37-d9ea-0310-8a92-e5e31aec5664