Added chapter 3 link

Author: AristurtleDev

articles/tutorials/building_2d_games/index.md

@@ -22,7 +22,8 @@ This documentation will introduce game development concepts using the MonoGame f
 | Chapter                                              | Summary                                                                                                                 | Source Files |
 | ---------------------------------------------------- | ----------------------------------------------------------------------------------------------------------------------- | ------------ |
 | [01: What Is Monogame](01_what_is_monogame/index.md) | The history of MonoGame and what features it provides developers to create games.                                       |              |
-| [02: Getting Started](02_getting_started/index.md)   | setup with MonoGame by preparing your environment for dotnet development and setting up Visual Studio Code as your IDE. |              |
+| [02: Getting Started](02_getting_started/index.md)   | Setup with MonoGame by preparing your environment for dotnet development and setting up Visual Studio Code as your IDE. |              |
+| [03: The Game1 File](03_the_game1_file/index.md)     | Explore the contents of the Game1 file generated when a new MonoGame game project is created.                           |              |
 
 In additional to the chapter documentation, supplemental documentation is also provided to give a more in-depth look at different topics with MonoGame. These are provided through the Appendix documentation below: