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### Steps to perform migration of MvvmCross using PCL
(primarily done is Visual Studio for Mac)
This tutorial migrates 
- PCL .Net solution to .NetStandard, 
- MvvmCross 5 solution to MvvmCross 7.1, 
- Android to AndroidX

#### The beginning
1. Create a new repository, with a Migration suffix
2. Inside it, create a New Blank Native Xamarin Template

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// Note: For this to work, you just need to put your spreadsheet ID here in lines 26 and 43 and follow this tutorial https://medium.com/@prototypemakers/simplest-universal-free-game-leaderboard-with-google-sheets-5ab548db009f
// to see the steps for implementing this

// POST and GET API Entry points
// ------------

function doPost(request){
  var requestObject = JSON.parse(request.postData.contents);
  var result = processPostRequest(requestObject);
  return ContentService

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using System.Threading.Tasks;
using AppIconUpdater.iOS;
using Xamarin.Forms;
using ui = UIKit.UIApplication;
[assembly: Dependency(typeof(IconSwitchService))]
namespace {YourNamespace}.iOS
{
    public class IconSwitchService : IIconSwitchService
    {
        public async Task SwitchAppIconAsync(string iconName)

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using Android;
using Android.App;
using Android.Media;
using Android.OS;
using Java.IO;

[assembly: Xamarin.Forms.Dependency(typeof(BackgroundRecord.Droid.AudioRecordingService))]
[assembly: UsesPermission(Manifest.Permission.RecordAudio)]
[assembly: UsesPermission(Manifest.Permission.ReadExternalStorage)]
[assembly: UsesPermission(Manifest.Permission.WriteExternalStorage)]

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using System;
using System.Timers;
using Android.App;
using Android.Content;
using Android.OS;

namespace SampleBackgroundServices.Droid
{
    public class TimeTrackingService : Service
    {

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[assembly: Xamarin.Forms.Dependency(typeof(NAMESPACE.Droid.InAppReviewService))]
namespace NAMESPACE.Droid
{
    public class InAppReviewService : IInAppReview
    {
        public void LaunchReview()
        {
#if DEBUG
            // FakeReviewManager does not interact with the Play Store, so no UI is shown
            // and no review is performed. Useful for unit tests.

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/* Steps:
1. Change the targetframework of your android project to Android 10 or above
2. Then add this file to your project either in one file or separate files.
3. Change the namespace from App.Droid to your Android project's namespace. 
4. Then in all activities that inherit MvxAppCompatActivity or MvxActivity, add this override and build:
        protected override void AttachBaseContext(Context @base)
        {
            base.AttachBaseContext(MvxContextWrapper2.Wrap(@base, this));
        }
*/

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var client = new HttpClient();
var model = new FeedbackModel()
{
    Name = NameEntry.Text,
    Phone = PhoneEntry.Text,
    Email = EmailEntry.Text,
    Feedback = FeedbackEntry.Text
};
var uri = "{WebAppUrl}";
var jsonString = JsonConvert.SerializeObject(model);

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<ContentPage xmlns="http://xamarin.com/schemas/2014/forms"
             xmlns:x="http://schemas.microsoft.com/winfx/2009/xaml"
             xmlns:d="http://xamarin.com/schemas/2014/forms/design"
             xmlns:mc="http://schemas.openxmlformats.org/markup-compatibility/2006"
             mc:Ignorable="d" x:Class="XamarinGoogleSheetsDB.MainPage"
             BackgroundColor="LightGray">
    <StackLayout HorizontalOptions="CenterAndExpand" VerticalOptions="CenterAndExpand" Padding="40" WidthRequest="400">
        <Label Text="FEEDBACK" FontAttributes="Bold" FontSize="Title"/>
        <Entry x:Name="NameEntry" Placeholder="Name" ReturnType="Next" />
        <Entry x:Name="EmailEntry" Placeholder="Email" ReturnType="Next" Keyboard="Email" />

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function doPost(request){
  // Open Google Sheet using ID
  var sheet = SpreadsheetApp.openById("{SheetID}");
  var result = {"Status": "SUCCESS", "Message": "Thank you for your feedback"};
  try{
    // Convert post data content to a JS object
    var resultObject = JSON.parse(request.postData.contents)
    // Append data on Google Sheet
    var rowData = sheet.appendRow([resultObject.Name, resultObject.Email, resultObject.Phone, resultObject.Feedback]);
  }catch(exc){