Added 9 Buttons for the playfield

src/main/java/game/StartTicTacToeGame.java

@@ -3,6 +3,7 @@ package game;
 import java.awt.Color;
 import java.awt.Font;
 
+import javax.swing.JButton;
 import javax.swing.JFrame;
 import javax.swing.JLabel;
 
@@ -11,6 +12,17 @@ import Gui.gui;
 
 public class StartTicTacToeGame{
 	
+	static JButton button = new JButton();
+	static JButton button2 = new JButton();
+	static JButton button3 = new JButton();
+	static JButton button4 = new JButton();
+	static JButton button5 = new JButton();
+	static JButton button6 = new JButton();
+	static JButton button7 = new JButton();
+	static JButton button8 = new JButton();
+	static JButton button9 = new JButton();
+	static JButton backButton = new JButton();
+	
 	static JLabel label = new JLabel();