Added JavaDoc for RegisterController.java

Author: CSE-AashrithA

src/main/java/com/escapegame/RegisterController.java

@@ -3,13 +3,17 @@
 import java.io.IOException;
 
 import com.model.AuthenticationService;
+
 import javafx.fxml.FXML;
 import javafx.scene.control.Label;
 import javafx.scene.control.TextField;
 import javafx.scene.input.MouseEvent;
 
 /**
  * Controller for register.fxml
+ * Handles user registration by validating form inputs and
+ * calling {@link AuthenticationService#register(String, String, String, String, String)}.
+ * Navigates to the login screen on success or shows an error message on failure.
  */
 public class RegisterController {
 
@@ -26,7 +30,14 @@ public class RegisterController {
     private Label lbl_error;
 
     private final AuthenticationService authService = new AuthenticationService();
-
+    /**
+     * Handles the Register button click event.
+     * Validates that all required fields are filled, attempts to register
+     * the user, and navigates to the login screen if successful. Displays
+     * an error message otherwise.
+     * @param event the mouse event triggered by the button click
+     * @throws IOException if navigation to another scene fails
+     */
     @FXML
     private void btnRegisterClicked(MouseEvent event) throws IOException {
         String userId = txt_userId.getText();
@@ -58,7 +69,12 @@ private void btnRegisterClicked(MouseEvent event) throws IOException {
             lbl_error.setVisible(true);
         }
     }
-
+    /**
+     * Handles the Back button click event.
+     * Navigates back to the home screen.
+     * @param event the mouse event triggered by the button click
+     * @throws IOException if navigation fails
+     */
     @FXML
     private void back(MouseEvent event) throws IOException {
         App.setRoot("home");