added cardstack to place played cards at the centre of the table

card_stack.gd

@@ -0,0 +1,18 @@
+class_name CardStack
+extends Node3D
+
+var _card_height: float = 0.06
+
+func add_card(card: PlayingCard) -> void:
+	var height = self.get_child_count() * _card_height
+	self.add_child(card)
+	card.translate(Vector3(0, height, 0))
+
+func add_card_by_id(card_id: int) -> void:
+	var playing_card: PlayingCard = PlayingCard.new()
+	playing_card.setup_card_details(card_id)
+	add_card(playing_card)
+
+func purge_cards() -> void:
+	while get_child_count() > 0:
+		remove_child(get_children()[get_child_count() - 1])