[App] initial iOS App with .gitignore

1. New Project > iOS > Application > Single View Application

   Product Name:      apns-app-demo
   Bundle Identifier: com.zlargon.apns-app-demo
   Devices:           Universal

2. Objective-C.gitignore
   https://github.com/github/gitignore/blob/master/Objective-C.gitignore
[App] setup app provisioning profile

apns-app-demo.xcodeproj > Build Setting > Code Signing > Provisioning Profile > "APNS App Demo"
[App][UI] add title "APNS Demo" at storyboard
[App][APNS] register to APN Server and get the device token

1. register APNS in method application:didFinishLaunchingWithOptions:

2. receive response from callback, and display in xcode console
   * application:didRegisterForRemoteNotificationsWithDeviceToken:
   * application:didFailToRegisterForRemoteNotificationsWithError: