created closing game button

src/main/java/Gui/GameGui.java

@@ -17,7 +17,7 @@ public class GameGui implements GameGuiInterface {
 
 public static JPanel MainPanel, ButtonPanel, headingPanel, WinningPanel, LosingPanel;
 public static JLabel Headline,QuestionLabel,WinningLabel, LosingLabel;
-public static JButton AnswersBtn1,AnswersBtn2,AnswersBtn3,AnswersBtn4,RestartBtn;
+public static JButton AnswersBtn1,AnswersBtn2,AnswersBtn3,AnswersBtn4,RestartBtn,ClosingBtn;
 public static int questionNr = 0;
 GridLayout grid;
 GridBagConstraints gbc;
@@ -137,9 +137,12 @@ GridBagConstraints gbc;
         gbc.ipady = 100;
         gbc.insets = new Insets(20, 0, 0, 0);
 		RestartBtn = new JButton("Neustarten");
+		ClosingBtn = new JButton("Schliessen");
 		
 		LosingPanel.add(LosingLabel,gbc);
 		LosingPanel.add(RestartBtn,gbc);
+		LosingPanel.add(ClosingBtn,gbc);
+		
 		RestartBtn.addActionListener(new RestartGame());
 	}
 }