Create your app in any technology of your choice ( PHP, AJAX, jQuery, AngularJS, Android, iOS, Python, NodeJS, or any other technology). You don't have to host your code on Programmr if you don't want to. If you submit a working URL along with its corresponding github URL , that's fine too.
Code your app and ensure it matches all the specifications of the mission.
Submit your app to the contest by choosing "CSS-1 Prototype Programming Contest" as the contest name.