Adding first version of my plugin

git-svn-id: https://plugins.svn.wordpress.org/mygiveaway/trunk@995674 b8457f37-d9ea-0310-8a92-e5e31aec5664
Updated the readme.txt file to pass validation check

git-svn-id: https://plugins.svn.wordpress.org/mygiveaway/trunk@995678 b8457f37-d9ea-0310-8a92-e5e31aec5664