iOS: Add digital ink quickstart sample

ios/quickstarts/digitalinkrecognition/DigitalInkRecognitionExample/AppDelegate.swift

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+import UIKit
+
+@UIApplicationMain
+class AppDelegate: UIResponder, UIApplicationDelegate {
+
+  var window: UIWindow?
+
+  func application(
+    _ application: UIApplication,
+    didFinishLaunchingWithOptions launchOptions: [UIApplication.LaunchOptionsKey: Any]?
+  ) -> Bool {
+    // Override point for customization after application launch.
+    return true
+  }
+
+  // MARK: UISceneSession Lifecycle
+
+  @available(iOS 13.0, *)
+  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)
+  }
+
+  @available(iOS 13.0, *)
+  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.
+  }
+
+}

ios/quickstarts/digitalinkrecognition/DigitalInkRecognitionExample/Info.plist

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+<?xml version="1.0" encoding="UTF-8"?>
+<!DOCTYPE plist PUBLIC "-//Apple//DTD PLIST 1.0//EN" "http://www.apple.com/DTDs/PropertyList-1.0.dtd">
+<plist version="1.0">
+<dict>
+	<key>UIUserInterfaceStyle</key>
+	<string>Light</string>
+	<key>CFBundleDevelopmentRegion</key>
+	<string>$(DEVELOPMENT_LANGUAGE)</string>
+	<key>CFBundleExecutable</key>
+	<string>$(EXECUTABLE_NAME)</string>
+	<key>CFBundleIdentifier</key>
+	<string>$(PRODUCT_BUNDLE_IDENTIFIER)</string>
+	<key>CFBundleInfoDictionaryVersion</key>
+	<string>6.0</string>
+	<key>CFBundleName</key>
+	<string>$(PRODUCT_NAME)</string>
+	<key>CFBundlePackageType</key>
+	<string>APPL</string>
+	<key>CFBundleShortVersionString</key>
+	<string>1.0</string>
+	<key>CFBundleVersion</key>
+	<string>1</string>
+	<key>LSRequiresIPhoneOS</key>
+	<true/>
+	<key>UIApplicationSceneManifest</key>
+	<dict>
+		<key>UIApplicationSupportsMultipleScenes</key>
+		<false/>
+		<key>UISceneConfigurations</key>
+		<dict>
+			<key>UIWindowSceneSessionRoleApplication</key>
+			<array>
+				<dict>
+					<key>UISceneConfigurationName</key>
+					<string>Default Configuration</string>
+					<key>UISceneDelegateClassName</key>
+					<string>SceneDelegate</string>
+					<key>UISceneStoryboardFile</key>
+					<string>Main</string>
+				</dict>
+			</array>
+		</dict>
+	</dict>
+	<key>UILaunchStoryboardName</key>
+	<string>LaunchScreen</string>
+	<key>UIMainStoryboardFile</key>
+	<string>Main</string>
+	<key>UIRequiredDeviceCapabilities</key>
+	<array>
+		<string>armv7</string>
+	</array>
+	<key>UISupportedInterfaceOrientations</key>
+	<array>
+		<string>UIInterfaceOrientationPortrait</string>
+	</array>
+	<key>UISupportedInterfaceOrientations~ipad</key>
+	<array>
+		<string>UIInterfaceOrientationPortrait</string>
+	</array>
+</dict>
+</plist>

ios/quickstarts/digitalinkrecognition/DigitalInkRecognitionExample/RecognizedInk.swift

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+import Foundation
+
+import MLKit
+
+class RecognizedInk: NSObject {
+
+  /** Ink, displayed to the user. */
+  var ink: Ink
+  /** Top recognition result candidate for the ink, displayed to the user. */
+  var text: String? = nil
+
+  /**
+   * Creates a `RecognizedInk` with the given `Ink` once it is sent for recognition. Text is initially
+   * empty.
+   * @param ink The ink to be stored in the `RecognizedInk` object.
+   * @return the initialized `RecognizedInk` object.
+   */
+  init(ink: Ink) {
+    self.ink = ink
+  }
+
+}

ios/quickstarts/digitalinkrecognition/DigitalInkRecognitionExample/SceneDelegate.swift

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+import UIKit
+
+@available(iOS 13.0, *)
+@objc(SceneDelegate)
+class SceneDelegate: UIResponder, UIWindowSceneDelegate {
+
+  var window: UIWindow?
+
+  func scene(
+    _ scene: UIScene, willConnectTo session: UISceneSession,
+    options connectionOptions: UIScene.ConnectionOptions
+  ) {
+    // Use this method to optionally configure and attach the UIWindow `window` to the provided UIWindowScene `scene`.
+    // If using a storyboard, the `window` property will automatically be initialized and attached to the scene.
+    // This delegate does not imply the connecting scene or session are new (see `application:configurationForConnectingSceneSession` instead).
+    guard let _ = (scene as? UIWindowScene) else { return }
+  }
+
+  func sceneDidDisconnect(_ scene: UIScene) {
+    // Called as the scene is being released by the system.
+    // This occurs shortly after the scene enters the background, or when its session is discarded.
+    // Release any resources associated with this scene that can be re-created the next time the scene connects.
+    // The scene may re-connect later, as its session was not necessarily discarded (see `application:didDiscardSceneSessions` instead).
+  }
+
+  func sceneDidBecomeActive(_ scene: UIScene) {
+    // Called when the scene has moved from an inactive state to an active state.
+    // Use this method to restart any tasks that were paused (or not yet started) when the scene was inactive.
+  }
+
+  func sceneWillResignActive(_ scene: UIScene) {
+    // Called when the scene will move from an active state to an inactive state.
+    // This may occur due to temporary interruptions (ex. an incoming phone call).
+  }
+
+  func sceneWillEnterForeground(_ scene: UIScene) {
+    // Called as the scene transitions from the background to the foreground.
+    // Use this method to undo the changes made on entering the background.
+  }
+
+  func sceneDidEnterBackground(_ scene: UIScene) {
+    // Called as the scene transitions from the foreground to the background.
+    // Use this method to save data, release shared resources, and store enough scene-specific state information
+    // to restore the scene back to its current state.
+  }
+
+}