adding first version of mydownload plugin

git-svn-id: https://plugins.svn.wordpress.org/mydownload/trunk@920710 b8457f37-d9ea-0310-8a92-e5e31aec5664
adding first version of mydownload plugin

git-svn-id: https://plugins.svn.wordpress.org/mydownload/trunk@920711 b8457f37-d9ea-0310-8a92-e5e31aec5664