Use a split-view controller as the main (root) view controller

Signed-off-by: Roopesh Chander <roop@roopc.net>

WireGuard/WireGuard/UI/iOS/MainViewController.swift

@@ -8,8 +8,16 @@
 
 import UIKit
 
-class MainViewController: UIViewController {
+class MainViewController: UISplitViewController {
     override func loadView() {
-        self.view = UIView()
+        let detailVC = UIViewController()
+        let detailNC = UINavigationController(rootViewController: detailVC)
+
+        let masterVC = TunnelsListTableViewController()
+        let masterNC = UINavigationController(rootViewController: masterVC)
+
+        self.viewControllers = [ masterNC, detailNC ]
+
+        super.loadView()
     }
 }

WireGuard/WireGuard/UI/iOS/TunnelsListTableViewController.swift

@@ -0,0 +1,35 @@
+//
+//  TunnelsListTableViewController.swift
+//  WireGuard
+//
+//  Created by Roopesh Chander on 12/10/18.
+//  Copyright © 2018 Roopesh Chander. All rights reserved.
+//
+
+import UIKit
+
+class TunnelsListTableViewController: UITableViewController {
+
+    override func viewDidLoad() {
+        super.viewDidLoad()
+        self.title = "WireGuard"
+        let addButtonItem = UIBarButtonItem(barButtonSystemItem: .add, target: self, action: #selector(addButtonTapped(sender:)))
+        self.navigationItem.rightBarButtonItem = addButtonItem
+    }
+
+    @objc func addButtonTapped(sender: UIBarButtonItem!) {
+        print("Add button tapped")
+    }
+}
+
+// MARK: UITableViewDataSource
+
+extension TunnelsListTableViewController {
+    override func numberOfSections(in tableView: UITableView) -> Int {
+        return 0
+    }
+
+    override func tableView(_ tableView: UITableView, numberOfRowsInSection section: Int) -> Int {
+        return 0
+    }
+}