Added the fourth Button to the GUI

src/main/java/game/StartTicTacToeGame.java

@@ -62,6 +62,12 @@ public class StartTicTacToeGame implements ActionListener{
 		button3.setBounds(500, 100, 100,100);
 		button3.addActionListener(this);
 		gui.Frame.add(button3);
+		
+		button4 = new JButton();
+		button4.setBackground(Color.white);
+		button4.setBounds(200, 250, 100,100);
+		button4.addActionListener(this);
+		gui.Frame.add(button4);
 	}