Make it possible to join with arrows2 input mapping

Assets/Scripts/Menu.cs

@@ -119,6 +119,26 @@ public class Menu : MonoBehaviour
       }
 
     }
+    if (Input.GetKeyDown(KeyCode.Hash))
+    {
+      if (ArrowAdded)
+      {
+        if (startGameIfPossible())
+        {
+          return;
+        }
+      }
+      else
+      {
+        int playerNumber = addPlayer();
+        if (playerNumber > 0)
+        {
+          ArrowAdded = true;
+          inputMappings[playerNumber - 1].set(controlType.ARROWS2);
+        }
+      }
+
+    }
     if (GamePad.GetButtonDown(GamePad.Button.A, GamePad.Index.One))
     {
       if (GP1Added)