Create Terrain2 app, using Xcode's boilerplate

Terrain2/AppDelegate.swift

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+//
+//  AppDelegate.swift
+//  Terrain2
+//
+//  Created by Eryn Wells on 11/3/18.
+//  Copyright © 2018 Eryn Wells. All rights reserved.
+//
+
+import Cocoa
+
+@NSApplicationMain
+class AppDelegate: NSObject, NSApplicationDelegate {
+    
+    @IBOutlet weak var window: NSWindow!
+    
+    func applicationDidFinishLaunching(_ aNotification: Notification) {
+        
+    }
+
+    func applicationWillTerminate(_ aNotification: Notification) {
+        
+    }
+    
+    func applicationShouldTerminateAfterLastWindowClosed(_ sender: NSApplication) -> Bool {
+        return true
+    }
+    
+}