Adding first version of wp-announce - please report bugs

git-svn-id: https://plugins.svn.wordpress.org/wp-announce/trunk@860584 b8457f37-d9ea-0310-8a92-e5e31aec5664
Adding first screenshots for wp-announce and updated readme.txt

git-svn-id: https://plugins.svn.wordpress.org/wp-announce/trunk@860588 b8457f37-d9ea-0310-8a92-e5e31aec5664