readme

git-svn-id: https://plugins.svn.wordpress.org/responsive-full-background/trunk@1018433 b8457f37-d9ea-0310-8a92-e5e31aec5664
responsive-full-background

git-svn-id: https://plugins.svn.wordpress.org/responsive-full-background/trunk@1018437 b8457f37-d9ea-0310-8a92-e5e31aec5664