feat: complete connection scene

config.yaml

@@ -38,7 +38,7 @@ position:
   # connection scene
   game-id-label: [200, 300]
   connecting-label: [280, 300]
-  waiting-opponent-label: [200, 300]
+  waiting-for-opponent-label: [200, 300]
   # multi player game scene
   well-player-1: [80, 80]
   well-player-2: [480, 80]
@@ -61,6 +61,7 @@ engine:
   cursor-blink-interval: 150
   period-blink-interval: 300
   lines-per-level: 55
+  ping-interval: 1500
   # piece 
   piece-drop-delay: 600
   piece-lock-delay: 1000