Issue #2161793 by boris sondagh, arrrgh, jhodgdon, catch, benjy: Create...

Issue #2161793 by boris sondagh, arrrgh, jhodgdon, catch, benjy: Create hook_help for migrate module

core/modules/migrate/migrate.module

+<?php
+
+/**
+ * @file
+ * Provides the Migrate API.
+ */
+
+use Drupal\Core\Routing\RouteMatchInterface;
+
+/**
+ * Implements hook_help().
+ */
+function migrate_help($route_name, RouteMatchInterface $route_match) {
+  switch ($route_name) {
+    case 'help.page.migrate':
+      $output = '<h3>' . t('About') . '</h3>';
+      $output .= '<p>';
+      $output .= t('The Migrate module provides a framework for migrating data, usually from an external source into your site. It does not provide a user interface. For more information, see the <a href="!migrate">online documentation for the Migrate module</a>.', array('!migrate' => 'https://www.drupal.org/documentation/modules/migrate'));
+      $output .= '</p>';
+      return $output;
+  }
+}