Added textfield for username input

src/main/java/LoginGUI.java

@@ -4,6 +4,7 @@ import java.awt.event.ActionListener;
 import java.util.List;
 
 public class LoginGUI extends JFrame implements ActionListener {
+    private JTextField usernameField;
 
     public LoginGUI() {
         setTitle("Login");
@@ -11,6 +12,13 @@ public class LoginGUI extends JFrame implements ActionListener {
         setDefaultCloseOperation(EXIT_ON_CLOSE);
         setLayout(null);
 
+        JLabel usernameLabel = new JLabel("Username:");
+        usernameLabel.setBounds(20, 20, 80, 25);
+        add(usernameLabel);
+
+        usernameField = new JTextField();
+        usernameField.setBounds(100, 20, 160, 25);
+        add(usernameField);
         
     }