initial

src/App.swift

@@ -0,0 +1,21 @@
+import UIKit
+
+@UIApplicationMain
+class AppDelegate: UIResponder, UIApplicationDelegate
+{
+    var window: UIWindow?
+
+    func application(
+        _ application: UIApplication,
+        didFinishLaunchingWithOptions launchOptions: [UIApplication.LaunchOptionsKey: Any]?
+    ) -> Bool {
+        window = UIWindow(frame: UIScreen.main.bounds)
+        let vc = UIViewController()
+        vc.view.backgroundColor = .gray
+        window?.rootViewController = vc
+        window?.backgroundColor = UIColor.white
+        window?.makeKeyAndVisible()
+
+        return true
+    }
+}