clean install

web/modules/config_update/config_update.module

@@ -0,0 +1,21 @@
+<?php
+
+/**
+ * @file
+ * Configuration Update Base module.
+ */
+
+use Drupal\Core\Routing\RouteMatchInterface;
+
+/**
+ * Implements hook_help().
+ */
+function config_update_help($route_name, RouteMatchInterface $route_match) {
+  switch ($route_name) {
+    case 'help.page.config_update':
+      $output = '';
+      $output .= '<h3>' . t('About') . '</h3>';
+      $output .= '<p>' . t('The Configuration Update Base module provides functionality that other modules can use, related to updating and computing differences between configuration versions. This module does not provide any end-user functionality itself.') . '</p>';
+      return $output;
+  }
+}