add SDL3 repository to game engine

examples/audio/01-simple-playback/README.txt

@@ -1,5 +1,5 @@
-If you're running this in a web browser, you need to click the window before you'll hear anything!
-
-This example code creates a simple audio stream for playing sound, and
-generates a sine wave sound effect for it to play as time goes on. This is the
-simplest way to get up and running with procedural sound.
+If you're running this in a web browser, you need to click the window before you'll hear anything!
+
+This example code creates a simple audio stream for playing sound, and
+generates a sine wave sound effect for it to play as time goes on. This is the
+simplest way to get up and running with procedural sound.