restoring osx sdk dir

integrations/apple/example_app/Example_OSX_App/AppDelegate.swift

@@ -0,0 +1,26 @@
+//
+//  AppDelegate.swift
+//  Example_OSX_App
+//
+//  Created by Joseph Henry on 6/22/16.
+//  Copyright © 2016 ZeroTier Inc. All rights reserved.
+//
+
+import Cocoa
+
+@NSApplicationMain
+class AppDelegate: NSObject, NSApplicationDelegate {
+
+
+
+    func applicationDidFinishLaunching(aNotification: NSNotification) {
+        // Insert code here to initialize your application
+    }
+
+    func applicationWillTerminate(aNotification: NSNotification) {
+        // Insert code here to tear down your application
+    }
+
+
+}
+