feature: Ported the sample project to MacOS swift with some minor mod…

Example-macOS-Swift/GTMAppAuth-Swift-Bridging-Header.h

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+//
+//  Use this file to import your target's public headers that you would like to expose to Swift.
+//
+

Example-macOS-Swift/GTMAppAuth-Swift.xcodeproj/xcuserdata/grantk2.xcuserdatad/xcschemes/xcschememanagement.plist

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+<?xml version="1.0" encoding="UTF-8"?>
+<!DOCTYPE plist PUBLIC "-//Apple//DTD PLIST 1.0//EN" "http://www.apple.com/DTDs/PropertyList-1.0.dtd">
+<plist version="1.0">
+<dict>
+	<key>SchemeUserState</key>
+	<dict>
+		<key>GTMAppAuth-Swift.xcscheme</key>
+		<dict>
+			<key>orderHint</key>
+			<integer>5</integer>
+		</dict>
+	</dict>
+</dict>
+</plist>

Example-macOS-Swift/GTMAppAuth-Swift.xcworkspace/xcuserdata/grantk2.xcuserdatad/xcdebugger/Breakpoints_v2.xcbkptlist

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+<?xml version="1.0" encoding="UTF-8"?>
+<Bucket
+   type = "0"
+   version = "2.0">
+   <Breakpoints>
+      <BreakpointProxy
+         BreakpointExtensionID = "Xcode.Breakpoint.FileBreakpoint">
+         <BreakpointContent
+            shouldBeEnabled = "Yes"
+            ignoreCount = "0"
+            continueAfterRunningActions = "No"
+            filePath = "GTMAppAuth-Swift/GTMAppAuthViewController.swift"
+            timestampString = "541104269.898721"
+            startingColumnNumber = "9223372036854775807"
+            endingColumnNumber = "9223372036854775807"
+            startingLineNumber = "101"
+            endingLineNumber = "101"
+            landmarkName = "userinfo(_:)"
+            landmarkType = "7">
+         </BreakpointContent>
+      </BreakpointProxy>
+   </Breakpoints>
+</Bucket>

Example-macOS-Swift/GTMAppAuth-Swift/AppDelegate.swift

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+//
+//  AppDelegate.swift
+//  GTMAppAuth-Swift
+//
+//  Created by Grant K2 on 20/02/2018.
+//  Copyright © 2018 Google. All rights reserved.
+//
+
+import Cocoa
+import GTMAppAuth
+
+@NSApplicationMain
+class AppDelegate: NSObject, NSApplicationDelegate {
+
+    var window: NSWindow?
+
+    var currentAuthorizationFlow:OIDAuthorizationFlowSession?
+
+
+    func applicationDidFinishLaunching(_ aNotification: Notification) {
+        // Register for Call back URL events
+        let aem = NSAppleEventManager.shared();
+        aem.setEventHandler(self, andSelector: #selector(AppDelegate.handleGetURLEvent(event:replyEvent:)), forEventClass: AEEventClass(kInternetEventClass), andEventID: AEEventID(kAEGetURL))
+
+    }
+
+    func applicationWillTerminate(_ aNotification: Notification) {
+        // Insert code here to tear down your application
+    }
+
+    func applicationWillFinishLaunching(notification: NSNotification?) {
+        // -- launch the app with url
+    }
+
+    @objc func handleGetURLEvent(event: NSAppleEventDescriptor, replyEvent: NSAppleEventDescriptor) {
+
+    let urlString = event.paramDescriptor(forKeyword: AEKeyword(keyDirectObject))?.stringValue!
+        let url = URL(string: urlString!)!
+        currentAuthorizationFlow?.resumeAuthorizationFlow(with: url)
+    }
+}
+

Example-macOS-Swift/GTMAppAuth-Swift/Assets.xcassets/AppIcon.appiconset/Contents.json

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+{
+  "images" : [
+    {
+      "idiom" : "mac",
+      "size" : "16x16",
+      "scale" : "1x"
+    },
+    {
+      "idiom" : "mac",
+      "size" : "16x16",
+      "scale" : "2x"
+    },
+    {
+      "idiom" : "mac",
+      "size" : "32x32",
+      "scale" : "1x"
+    },
+    {
+      "idiom" : "mac",
+      "size" : "32x32",
+      "scale" : "2x"
+    },
+    {
+      "idiom" : "mac",
+      "size" : "128x128",
+      "scale" : "1x"
+    },
+    {
+      "idiom" : "mac",
+      "size" : "128x128",
+      "scale" : "2x"
+    },
+    {
+      "idiom" : "mac",
+      "size" : "256x256",
+      "scale" : "1x"
+    },
+    {
+      "idiom" : "mac",
+      "size" : "256x256",
+      "scale" : "2x"
+    },
+    {
+      "idiom" : "mac",
+      "size" : "512x512",
+      "scale" : "1x"
+    },
+    {
+      "idiom" : "mac",
+      "size" : "512x512",
+      "scale" : "2x"
+    }
+  ],
+  "info" : {
+    "version" : 1,
+    "author" : "xcode"
+  }
+}

Example-macOS-Swift/GTMAppAuth-Swift/GTMAppAuth-Swift.entitlements

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+<?xml version="1.0" encoding="UTF-8"?>
+<!DOCTYPE plist PUBLIC "-//Apple//DTD PLIST 1.0//EN" "http://www.apple.com/DTDs/PropertyList-1.0.dtd">
+<plist version="1.0">
+<dict>
+	<key>com.apple.security.app-sandbox</key>
+	<true/>
+	<key>com.apple.security.files.user-selected.read-only</key>
+	<true/>
+	<key>com.apple.security.network.client</key>
+	<true/>
+</dict>
+</plist>