Added support to exit a game on Android device when Back button is

clicked

src/GameEngine.c

@@ -7,6 +7,7 @@
 #include "SDL_events.h"
 #include "SDL_hints.h"
 #include "SDL_image.h"
+#include "SDL_keycode.h"
 #include "SDL_mixer.h"
 #include "SDL_pixels.h"
 #include "SDL_platform.h"
@@ -757,6 +758,13 @@ void handle_events() {
     switch (GameEngine.event.type) {
     case SDL_QUIT:
       GameEngine.running = false;
+      break;
+    case SDL_KEYUP:
+      if (GameEngine.event.key.keysym.sym == SDLK_AC_BACK) {
+        // Handle Android's back button
+        GameEngine.running = false;
+      }
+
       break;
     }