adding 502 error

games/snake502/js/controls.js

@@ -0,0 +1,20 @@
+// Handle keyboard controls
+var keysDown = {};
+
+var KEY_UP =38, KEY_DOWN =40, KEY_LEFT =37, KEY_RIGHT =39;
+
+addEventListener("keydown", function (e) {
+	keysDown[e.keyCode] = true;
+}, false);
+
+addEventListener("keyup", function (e) {
+	delete keysDown[e.keyCode];
+}, false);
+
+//Called from update.js
+var controls = function(){
+  if (KEY_LEFT in keysDown)  GAME_STATE.snake.move('l');
+  if (KEY_RIGHT in keysDown)  GAME_STATE.snake.move('r');
+	if (KEY_UP in keysDown)  GAME_STATE.snake.move('u');
+	if (KEY_DOWN in keysDown)  GAME_STATE.snake.move('d');
+}