Removing "readme.txt"

git-svn-id: https://plugins.svn.wordpress.org/immocaster/trunk@839551 b8457f37-d9ea-0310-8a92-e5e31aec5664
Importing readme.txt

git-svn-id: https://plugins.svn.wordpress.org/immocaster/trunk@839552 b8457f37-d9ea-0310-8a92-e5e31aec5664