delete readme.txt

git-svn-id: https://plugins.svn.wordpress.org/wp-social-popup-and-get-traffic/trunk@955717 b8457f37-d9ea-0310-8a92-e5e31aec5664
add readme.txt

git-svn-id: https://plugins.svn.wordpress.org/wp-social-popup-and-get-traffic/trunk@955718 b8457f37-d9ea-0310-8a92-e5e31aec5664