delete files

git-svn-id: https://plugins.svn.wordpress.org/yuzo-related-post/trunk@916934 b8457f37-d9ea-0310-8a92-e5e31aec5664
add main file

git-svn-id: https://plugins.svn.wordpress.org/yuzo-related-post/trunk@916935 b8457f37-d9ea-0310-8a92-e5e31aec5664