Added setup view controller to app extension.

src/iOS.Extension/SetupViewController.cs

@@ -0,0 +1,38 @@
+using System;
+using Bit.iOS.Extension.Models;
+using UIKit;
+using Plugin.Settings.Abstractions;
+
+namespace Bit.iOS.Extension
+{
+    public partial class SetupViewController : UIViewController
+    {
+        public SetupViewController(IntPtr handle) : base(handle)
+        { }
+
+        public Context Context { get; set; }
+        public LoadingViewController LoadingController { get; set; }
+
+        public override void ViewWillAppear(bool animated)
+        {
+            UINavigationBar.Appearance.ShadowImage = new UIImage();
+            UINavigationBar.Appearance.SetBackgroundImage(new UIImage(), UIBarMetrics.Default);
+            base.ViewWillAppear(animated);
+        }
+
+        public override void ViewDidLoad()
+        {
+            View.BackgroundColor = new UIColor(red: 0.94f, green: 0.94f, blue: 0.96f, alpha: 1.0f);
+            var descriptor = UIFontDescriptor.PreferredBody;
+            DescriptionLabel.Font = UIFont.FromDescriptor(descriptor, descriptor.PointSize);
+            DescriptionLabel.TextColor = new UIColor(red: 0.47f, green: 0.47f, blue: 0.47f, alpha: 1.0f);
+            ActivatedLabel.Font = UIFont.FromDescriptor(descriptor, descriptor.PointSize * 1.3f);
+            base.ViewDidLoad();
+        }
+
+        partial void BackButton_Activated(UIBarButtonItem sender)
+        {
+            LoadingController.CompleteRequest(null);
+        }
+    }
+}