Move SampleSwift project to xplat

Summary: Move SampleSwift project to xplat

Reviewed By: passy

Differential Revision: D8989867

fbshipit-source-id: cfda775ec3919d5c689aaf6846a870a2653c47a6

iOS/SampleSwift/SampleSwift/ViewController.swift

@@ -0,0 +1,18 @@
+// Copyright 2004-present Facebook. All Rights Reserved.
+
+import UIKit
+
+class ViewController: UIViewController {
+
+  override func viewDidLoad() {
+    super.viewDidLoad()
+    // Do any additional setup after loading the view, typically from a nib.
+  }
+
+  override func didReceiveMemoryWarning() {
+    super.didReceiveMemoryWarning()
+    // Dispose of any resources that can be recreated.
+  }
+
+
+}