Issue #2161797 by boris sondagh, mfernea, arrrgh, amitgoyal: Create hook_help...

Issue #2161797 by boris sondagh, mfernea, arrrgh, amitgoyal: Create hook_help for migrate drupal module

core/modules/migrate_drupal/migrate_drupal.module

 <?php
 
+/**
+ * @file
+ * Provides migration from other Drupal sites.
+ */
+
+use Drupal\Core\Routing\RouteMatchInterface;
+
 /**
  * Implements hook_entity_type_alter().
  */
@@ -9,3 +16,16 @@ function migrate_drupal_entity_type_alter(array &$entity_types) {
     ->setClass('Drupal\migrate_drupal\Entity\Migration')
     ->setHandlerClass('storage', 'Drupal\migrate_drupal\MigrationStorage');
 }
+
+/**
+ * Implements hook_help().
+ */
+function migrate_drupal_help($route_name, RouteMatchInterface $route_match) {
+  switch ($route_name) {
+    case 'help.page.migrate_drupal':
+      $output = '';
+      $output .= '<h3>' . t('About') . '</h3>';
+      $output .= '<p>' . t('The Migrate Drupal module provides a framework based on the <a href="!migrate">Migrate module</a> to facilitate migration from a Drupal (6, 7, or 8) site to your website. It does not provide a user interface. For more information, see the <a href="!migrate_drupal">online documentation for the Migrate Drupal module</a>.', array('!migrate' => \Drupal::url('help.page', array('name' => 'migrate')), '!migrate_drupal' => 'https://www.drupal.org/documentation/modules/migrate_drupal')) . '</p>';
+      return $output;
+  }
+}