added poses for items in shelf

Scripts/pose_item.gd

@@ -0,0 +1,18 @@
+extends Node3D
+
+var is_free: bool
+var item
+
+func _init() -> void:
+	is_free = true
+
+func add_item(new_item):
+	is_free = false
+	item = new_item
+	self.add_child(item)
+	item.position = global_position
+	print("item added")
+	
+
+func remove_item():
+	self.remove_child(item)