Added an engaging usecase to the readme

git-svn-id: https://plugins.svn.wordpress.org/loyaltyjs/trunk@1016104 b8457f37-d9ea-0310-8a92-e5e31aec5664
bold tags in story

git-svn-id: https://plugins.svn.wordpress.org/loyaltyjs/trunk@1016105 b8457f37-d9ea-0310-8a92-e5e31aec5664