Issue #3337580: Implement hook_help()

bootstrap_datetime_picker.module

@@ -4,3 +4,30 @@
  * @file
  * Empty module file.
  */
+
+use Drupal\Core\Routing\RouteMatchInterface;
+
+/**
+ * Implements hook_help().
+ */
+function bootstrap_datetime_picker_help($route_name, RouteMatchInterface $route_match) {
+  switch ($route_name) {
+    case 'help.page.bootstrap_datetime_picker':
+      $output = '';
+      $output .= '<h3>' . t('About') . '</h3>';
+      $output .= '<p>' . t('This module provides Bootstrap DateTime picker using library <a href=":library">https://github.com/Eonasdan/bootstrap-datetimepicker</a>.',
+        [
+          ':library' => 'https://github.com/Eonasdan/bootstrap-datetimepicker',
+        ] 
+      ) . '</p>';
+      // Add a link to the Drupal.org project.
+      $output .= '<p>';
+      $output .= t('Visit the <a href=":project_link">Bootstrap Datetime Picker project page</a> on Drupal.org for more information.',
+        [
+          ':project_link' => 'https://www.drupal.org/project/bootstrap_datetime_picker',
+        ]
+      );
+      $output .= '</p>';
+      return $output;
+  }
+}
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