feat: add undo

app/src/main/java/chess/model/Game.java

@@ -1,10 +1,15 @@
 package chess.model;
 
+import java.util.EmptyStackException;
+import java.util.Stack;
+
+import chess.controller.PlayerCommand;
 import chess.model.visitor.PawnIdentifier;
 
 public class Game {
 	private final ChessBoard board;
 	private Color playerTurn;
+	private final Stack<PlayerCommand> movesHistory;
 
 	public enum GameStatus {
 		Check, CheckMate, OnGoing, Pat;
@@ -12,6 +17,7 @@ public class Game {
 
 	public Game(ChessBoard board) {
 		this.board = board;
+		this.movesHistory = new Stack<>();
 	}
 
 	public ChessBoard getBoard() {
@@ -80,4 +86,17 @@ public class Game {
 		return null;
 	}
 
+	public void addAction(PlayerCommand command) {
+		this.movesHistory.add(command);
+	}
+
+	public PlayerCommand getLastAction() {
+		try {
+			PlayerCommand last = this.movesHistory.pop();
+			return last;
+		} catch (EmptyStackException e) {
+			return null;
+		}
+	}
+
 }