Update

src/main/java/GamePanel.java

@@ -0,0 +1,2 @@
+public class GamePanel {
+}

src/main/java/MenuPanel.java

@@ -1,2 +1,12 @@
-public class MenuPanel {
+import javax.swing.*;
+import java.awt.*;
+
+
+public class MenuPanel extends JPanel {
+
+    MenuPanel() {
+        this.addKeyListener(new MenuPanel.AL());
+        this.setBackground(Color.BLACK);
+        this.setFocusable(true);
+        this.setPreferredSize(GamePanel.SCREEN);
 }