Added hook help

codepen.module

@@ -5,6 +5,25 @@
  * Codepen field module adds a field for Codepen embeds.
  */
 
+use Drupal\Core\Routing\RouteMatchInterface;
+
+/**
+ * Implements hook_help().
+ */
+function codepen_help($route_name, RouteMatchInterface $route_match) {
+  switch ($route_name) {
+    case 'help.page.codepen':
+      $output = '';
+      $output .= '<h3>' . t('About') . '</h3>';
+      $output .= '<p>' . t('The Codepen module provides a field that allows you to add a Codepen.io embed to a content type, user, or any other Drupal entity.') . '</p>';
+      $output .= '<p>' . t('Visit the <a href=":project_link">Project page</a> on Drupal.org for more information.', [
+        ':project_link' => 'https://www.drupal.org/project/codepen',
+      ]);
+
+      return $output;
+  }
+}
+
 /**
  * Implements hook_menu_link_defaults().
  */