gameexplorer_gui: added actionListener for exit button

src/main/java/de/tims/gameexplorer/GameExplorer.java

@@ -97,6 +97,7 @@ public class GameExplorer {
 		logoutBtn.addActionListener(new LogoutAction());
 		exitBtn = new JButton("Exit");
 		exitBtn.setPreferredSize(smallBtnSize);
+		exitBtn.addActionListener(new ExitAction());
 		
 		border1 = new JPanel();
 		border1.setOpaque(false);
@@ -338,6 +339,15 @@ public class GameExplorer {
 		}
 	}
 	
+	private class ExitAction implements ActionListener {
+		@Override
+		public void actionPerformed(ActionEvent e) {
+			manager.savePlayers(PLAYER_FILE);
+			
+			System.exit(0);
+		}
+	}
+	
 	private class BackAction implements ActionListener {
 		@Override
 		public void actionPerformed(ActionEvent e) {