Add swift tutorials for basic call, voip push and chat features with SDK 5.0

ios/swift/4-CallKitTutorial/CallKitTutorial/AppDelegate.swift

@@ -0,0 +1,38 @@
+//
+//  AppDelegate.swift
+//  CallKitTutorial
+//
+//  Created by QuentinArguillere on 10/08/2020.
+//  Copyright © 2020 BelledonneCommunications. All rights reserved.
+//
+
+import UIKit
+import SwiftUI
+
+@UIApplicationMain
+class AppDelegate: UIResponder, UIApplicationDelegate {
+
+    @ObservedObject var tutorialContext = CallKitExampleContext()
+
+    func application(_ application: UIApplication, didFinishLaunchingWithOptions launchOptions: [UIApplication.LaunchOptionsKey: Any]?) -> Bool {
+        // Override point for customization after application launch.
+        return true
+    }
+
+    // MARK: UISceneSession Lifecycle
+
+    func application(_ application: UIApplication, configurationForConnecting connectingSceneSession: UISceneSession, options: UIScene.ConnectionOptions) -> UISceneConfiguration {
+        // Called when a new scene session is being created.
+        // Use this method to select a configuration to create the new scene with.
+        return UISceneConfiguration(name: "Default Configuration", sessionRole: connectingSceneSession.role)
+    }
+
+    func application(_ application: UIApplication, didDiscardSceneSessions sceneSessions: Set<UISceneSession>) {
+        // Called when the user discards a scene session.
+        // If any sessions were discarded while the application was not running, this will be called shortly after application:didFinishLaunchingWithOptions.
+        // Use this method to release any resources that were specific to the discarded scenes, as they will not return.
+    }
+
+
+}
+