Write an iPhone application

Create a timer app for two users 1. The timer starts when both users click start 2. The timer should start counting when both users have clicked start 3. Every minute update the time elapsed for each user in a database 3. The timer should stop counting when either user clicks stop 4. The other user should be notified when the other user has clicked stopped. 5. After the timer is stoped update the database with the duration for each user