Added screens in sample app for notification

Summary:
Added a basic communication flows and a button to trigger notification
{F142016937}

Reviewed By: jknoxville

Differential Revision: D10492428

fbshipit-source-id: b65fc46b3be695852f9197771a253d9e8596f328

iOS/Sample/CommunicationDemoViewController.h

@@ -0,0 +1,13 @@
+/*
+ *  Copyright (c) 2018-present, Facebook, Inc.
+ *
+ *  This source code is licensed under the MIT license found in the LICENSE
+ *  file in the root directory of this source tree.
+ *
+ */
+
+#import <UIKit/UIKit.h>
+
+@interface CommunicationDemoViewController : UIViewController<UITableViewDataSource>
+
+@end