-m additional comment

Assets/script/Heap.cs

@@ -8,6 +8,8 @@ public class Heap <Tile> where Tile : HeapItem<Tile>{
     Tile[] heapTiles;
     int itemCount;
 
+    //replace openList with Heap
+
     //add heapIndex, compareTo to tile class
     //compare fCost of node then hCost
     //item.compareTo(item2) should return pos if item is less than item2, neg if item is greater than item2