Create tile_layer_draw_order.md

docs/tile_layer_draw_order.md

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+# Tile Layer Draw Order
+
+The tile layers (layer 0 to 6) are drawn in this order:
+
+(with layer 0 being the furthest in the back and layer 2 at the front)
+```
+Layer 0
+Eggs
+Layer 3
+Layer 4
+Layer 1
+Layer 5
+Items
+Erina
+Layer 6
+Layer 2
+```
+
+Both layers 2 and 6 are hidden by the "hide layer 2" event.