Add a blue box
dd green box to @window
Add red box to @blue_view
add TapController.rb
update the UIView
add a label in TapController
update the backroundColor
use a UINavigationController in AppDelegate
add title for viewDidLoad method
add button in viewDidLoad
add push method in TapController
update the title in ciewDidLoad
add UITabBarController in AppDelegate
add iniWithNibName in TapController
add other_controller in AppDelegate