Rewriting TN in MonoGame #1: Setting Up the Project - Bootstrap files - related post at: http://retrocade.net/2016/10/07/rewriting-tn-in-monogame-1-setting-up-the-project/

Main.cs

using System;

namespace TransNeuronica
{
//#if WINDOWS || LINUX // This conditional compilation is commented out because right now not all constants are correctly defined
// and we can't add our own in a simple fashion. I'll figure it out later
    public static class Program
    {
        [STAThread]
        static void Main()
        {
            using (var game = new TransNeuronica())
                game.Run();
        }
    }
//#endif
}

TransNeuronica.cs

using Microsoft.Xna.Framework;
using Microsoft.Xna.Framework.Graphics;
using Microsoft.Xna.Framework.Input;

namespace TransNeuronica
{
    public class TransNeuronica : Game
    {
        private GraphicsDeviceManager _graphics;
        private SpriteBatch _spriteBatch;

        public TransNeuronica()
        {
            _graphics = new GraphicsDeviceManager(this);
            Content.RootDirectory = "Content";
        }

        protected override void Initialize()
        {
            base.Initialize();
        }

        protected override void LoadContent()
        {
            _spriteBatch = new SpriteBatch(GraphicsDevice);
        }

        protected override void UnloadContent()
        {
        }

        protected override void Update(GameTime gameTime)
        {
            if (GamePad.GetState(PlayerIndex.One).Buttons.Back ==
                ButtonState.Pressed || Keyboard.GetState().IsKeyDown(
                    Keys.Escape))
                Exit();
            base.Update(gameTime);
        }

        protected override void Draw(GameTime gameTime)
        {
            GraphicsDevice.Clear(Color.CornflowerBlue);
            base.Draw(gameTime);
        }
    }
}