Created TabViewController to main.storyboard and basic UI

The basic UI has been set up with three TabViews (Game, Statistics, Settings). This is being made in order to allow the user to interact with the application. One method was imlpemented in order to handle the start of the game loop -(void)playButtonPressed. This is called when the Play button is pressed, then -(void)startGameLoop will be called and the main game loop will be initialized and the game will begin.