Add description

git-svn-id: https://plugins.svn.wordpress.org/spider-event-calendar/trunk@785929 b8457f37-d9ea-0310-8a92-e5e31aec5664
bug fixed

git-svn-id: https://plugins.svn.wordpress.org/spider-event-calendar/trunk@787615 b8457f37-d9ea-0310-8a92-e5e31aec5664