Update toc and index for chapter 12

Author: AristurtleDev

articles/toc.yml

@@ -134,6 +134,8 @@
           href: tutorials/building_2d_games/10_input_management/
         - name: "11: Collision Detection"
           href: tutorials/building_2d_games/11_collision_detection/
+        - name: "12: Sound Effects and Music"
+          href: tutorials/building_2d_games/12_soundeffects_and_music/
 - name: Console Access
   href: console_access.md
 - name: Help and Support

articles/tutorials/building_2d_games/index.md

@@ -32,6 +32,7 @@ This documentation will introduce game development concepts using the MonoGame f
 | [09: Handling Input](09_handling_input/index.md)                             | Learn how to handle keyboard, mouse, and gamepad input in MonoGame.                                                                                                                               |              |
 | [10: Input Management](10_input_management/index.md)                         | Learn how to create an input management system to handle keyboard, mouse, and gamepad input, including state tracking between frames and creating a reusable framework for handling player input. |              |
 | [11: Collision Detection](11_collision_detection/index.md)                   | Learn how to implement collision detection between game objects and handle collision responses like blocking, triggering events, and bouncing.                                                    |              |
+| [12: Sound Effects and Music](12_soundeffects_and_music/index.md)            | Learn how to load and play sound effects and background music in MonoGame including managing audio volume, looping, and handling multiple sound effects at once.                                  |              |
 
 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: