Updated _Sidebar (markdown)

_Sidebar.md

@@ -14,6 +14,7 @@
 * [raylib custom shaders](raylib-generic-uber-shader-and-custom-shaders)
 * [raylib coding conventions](raylib-coding-conventions)
 * [raylib memory pools](raylib-memory-pool)
+* [raylib integration with other libs](raylib-integration-with-other-libraries)
 
 ## Development Platforms
 * [Working on Windows](Working-on-Windows)