added textfield for username to signup GUI

src/main/java/SignUpGUI.java

@@ -4,7 +4,7 @@ import java.awt.event.ActionListener;
 import java.util.UUID;
 
 public class SignUpGUI extends JFrame implements ActionListener {
-    
+	private JTextField usernameField;
 
     public SignUpGUI() {
         setTitle("Sign Up");
@@ -12,7 +12,13 @@ public class SignUpGUI 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);
     }
 
     @Override