began main page with reorganization.

RhythmBullet/Zer01HD/Game/Screens/MainMenu/MainPage.cs

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+using Microsoft.Xna.Framework.Graphics;
+using RhythmBullet.Zer01HD.UI.Book;
+using RhythmBullet.Zer01HD.Utilities.ContentSystem;
+using System;
+using System.Collections.Generic;
+using System.Linq;
+using System.Text;
+using System.Threading.Tasks;
+
+namespace RhythmBullet.Zer01HD.Game.Screens.MainMenu
+{
+    internal class MainPage : Page
+    {
+        internal MainPage(ContentSystem assets, GraphicsDevice graphicsDevice) : base(0, 0, graphicsDevice)
+        {
+            assets.Get<Texture2D>("title");
+        }
+    }
+}

RhythmBullet/Zer01HD/Game/Screens/MainMenu/MainScreen.cs

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+using Microsoft.Xna.Framework;
+using Microsoft.Xna.Framework.Graphics;
+using RhythmBullet.Zer01HD.Game.Screens.Transitions;
+using RhythmBullet.Zer01HD.UI;
+using RhythmBullet.Zer01HD.Utilities.ContentSystem;
+using RhythmBullet.Zer01HD.Utilities.UI;
+using RhythmBullet.Zer01HD.Utilities.ScreenSystem;
+using System;
+using System.Collections.Generic;
+using System.Diagnostics;
+using System.Linq;
+using System.Text;
+using System.Threading.Tasks;
+using RhythmBullet.Zer01HD.UI.Book;
+
+namespace RhythmBullet.Zer01HD.Game.Screens.MainMenu
+{
+    class MainScreen : Screen
+    {
+        FadeAwayTransition fat;
+        Texture2D background;
+        Book book;
+        public MainScreen(ContentSystem assets) : base(true)
+        {
+            background = assets.Get<Texture2D>("backgrounds/mainBG");
+            fat = new FadeAwayTransition(3f);
+            book = new Book(Camera);
+        } 
+
+        public override void Show()
+        {
+            Transitions.Add(fat);
+            base.Show();
+        }
+
+        public override void Draw(SpriteBatch spriteBatch)
+        {
+            book.Draw(spriteBatch);
+            spriteBatch.Draw(background, ScreenSize, Color.White);
+            base.Draw(spriteBatch);
+        }
+
+        public override void Update(GameTime gameTime)
+        {
+            book.Update(gameTime);
+            base.Update(gameTime);
+        }
+    }
+}