ensure people know we can drag & drop files here

git-svn-id: https://svn.apache.org/repos/asf/archiva/trunk@1542163 13f79535-47bb-0310-9956-ffa450edef68
add image

git-svn-id: https://svn.apache.org/repos/asf/archiva/trunk@1542164 13f79535-47bb-0310-9956-ffa450edef68