screenshot-1 added

git-svn-id: https://plugins.svn.wordpress.org/course/trunk@984221 b8457f37-d9ea-0310-8a92-e5e31aec5664
screenshot 2 added

git-svn-id: https://plugins.svn.wordpress.org/course/trunk@984223 b8457f37-d9ea-0310-8a92-e5e31aec5664
Screenshots added

git-svn-id: https://plugins.svn.wordpress.org/course/trunk@984224 b8457f37-d9ea-0310-8a92-e5e31aec5664