Build a (Iphone Application) with the following features.
The data have to be synced with a existing website - Joomla

1. Home - Google Maps
2. Add Event
3. Log in / create account
4. choose Categories
5. Invite Friends
6. Share Events
7. join existing event
8. see and setting All invitations
9. Search Location
10. Time setting
11. where am i button


This application should be (as possible) compatible with Android and Windows Mobile