Contest open only to students, hobbyists, or developers in the field of software technology 18+. Submission period ends 3/5/13 and public voting period ends 4/8/13. For details, see Official Rules.
All you have to do is register via our email opt-in and make sure your apps are live by 11:59 p.m. PST on March 5, 2013 in order to be included in the competition.
More detail here.
Windows Phone and Windows 8 developers can take advantage of the assistance through the Generation App program below.