add screen shot 10

git-svn-id: https://plugins.svn.wordpress.org/wp2yt-uploader/trunk@838718 b8457f37-d9ea-0310-8a92-e5e31aec5664
update readme.txt

git-svn-id: https://plugins.svn.wordpress.org/wp2yt-uploader/trunk@838719 b8457f37-d9ea-0310-8a92-e5e31aec5664