updated 404 page

examples/App/controllers/404.php

@@ -1 +1,14 @@
-<h1>This is 404</h1>
+<?php
+
+// Define our status code and message
+$status_code = 404;
+$status_message = 'The requested resource could not be found.';
+
+// Set the HTTP response code and message
+http_response_code($status_code);
+header("Content-Type: text/html");
+?>
+
+<h1>Error 404 Resource Not found</h1>
+<p><?php echo $status_message; ?></p>
+