delete readme.txt

git-svn-id: https://plugins.svn.wordpress.org/wp-widget-devices/trunk@878613 b8457f37-d9ea-0310-8a92-e5e31aec5664
upload readme.txt

git-svn-id: https://plugins.svn.wordpress.org/wp-widget-devices/trunk@878614 b8457f37-d9ea-0310-8a92-e5e31aec5664