removing old readme

git-svn-id: https://plugins.svn.wordpress.org/team-chart/trunk@781922 b8457f37-d9ea-0310-8a92-e5e31aec5664
add new readme

git-svn-id: https://plugins.svn.wordpress.org/team-chart/trunk@781924 b8457f37-d9ea-0310-8a92-e5e31aec5664