Using AdMob on a MonoGame for Android game

Activity1.cs

using System;

using Android.App;
using Android.Content;
using Android.Runtime;
using Android.Views;
using Android.Widget;
using Android.OS;

using Android.Gms.Ads;

using Microsoft.Xna.Framework;

namespace MyGame
{
	[Activity (Label = "MyGame", 
		MainLauncher = true,
		Icon = "@drawable/icon",
		Theme = "@style/Theme.Splash",
		AlwaysRetainTaskState = true,
		LaunchMode = Android.Content.PM.LaunchMode.SingleTask,
		ScreenOrientation = Android.Content.PM.ScreenOrientation.Portrait,
		ConfigurationChanges = Android.Content.PM.ConfigChanges.Orientation |
		Android.Content.PM.ConfigChanges.KeyboardHidden |
		Android.Content.PM.ConfigChanges.Keyboard)]
	public class Activity1 : AndroidGameActivity
	{
		private const string AD_UNIT_ID = "ca-app-pub-NNNNNNNNNNNNNNNNNNNNNNNNNNN";
        private const string INTERSTITIAL_AD_UNIT_ID = "ca-app-pub-NNNNNNNNNNNNNNNNNNNNNNNNNN";

		private const string TEST_DEVICE_ID = "YOUR_TEST_DEVICE_ID";

		private AdView adView;
        	private InterstitialAd intAdView;

		protected override void OnCreate(Bundle bundle)
		{
			base.OnCreate(bundle);

			// Create our OpenGL view, and display it
			var g = new Game1();
			createAds(g.Services.GetService<View>());
            		g.ad = adView;
            		g.interstitial = intAdView;
            		g.Reload = ReloadInterstitial;
			g.Run();
		}

		// Wrapped everything in a function for less confusion.
		// Thanks to Dylan Wilson at Craftwork Games for the
		// simple layout
		private void createAds(View window)
		{
			var frameLayout = new FrameLayout(this);
			var linearLayout = new LinearLayout(this);

			frameLayout.AddView(window);

			adView = new AdView(this);
			adView.AdUnitId = AD_UNIT_ID;
            		adView.AdSize = AdSize.SmartBanner;
			adView.SetBackgroundColor(Android.Graphics.Color.Black);

	            	intAdView = new InterstitialAd(this);
	            	intAdView.AdUnitId = INTERSTITIAL_AD_UNIT_ID;

			linearLayout.AddView(adView);
			frameLayout.AddView(linearLayout);
			SetContentView(frameLayout);

			try
			{
				// Initiate a generic request.
				var adRequest = new AdRequest.Builder()
					.AddTestDevice(AdRequest.DeviceIdEmulator)
					.AddTestDevice(TEST_DEVICE_ID)
					.Build();

				// Load the adView with the ad request.
				adView.LoadAd(adRequest);

                	ReloadInterstitial();

			}
			catch (Exception ex)
			{
				Console.WriteLine(ex.Message);
			}
		}

        public void ReloadInterstitial()
        {
            try
            {
                var request = new AdRequest.Builder()
                	.AddTestDevice(TEST_DEVICE_ID)
                	.Build();
                	intAdView.LoadAd(request);
            }
            catch (Exception ex)
            {
                Console.WriteLine(ex.Message);
            }
        }
	}
}

using Android.Gms.Ads; = ERROR What NuGet packages are needed ????
g.ad = adView;

        		g.interstitial = intAdView;

        		g.Reload = ReloadInterstitial;

All Give ERRORS AGAIN WHAT NUGET PACKAGES ARE REQUIRED!!!!!

http://community.monogame.net/t/admob-how-too-a-full-example/10793