If a user is already logged in, I want to open my HomeViewController; and if a user clicks on a push notification, I want to open my NotificationViewController.
func application(_ application: UIApplication, didFinishLaunchingWithOptions launchOptions:    [UIApplication.LaunchOptionsKey: Any]?) -> Bool {
    // What's code write for this functionality.
    return true
    }
Xcode 11.3.1
iOS 13