Now all modules are in core modules folder

modules/ckeditor/ckeditor.api.php

@@ -0,0 +1,65 @@
+<?php
+/**
+ * CKEditor - The text editor for the Internet - http://ckeditor.com
+ * Copyright (c) 2003-2013, CKSource - Frederico Knabben. All rights reserved.
+ *
+ * == BEGIN LICENSE ==
+ *
+ * Licensed under the terms of any of the following licenses of your
+ * choice:
+ *
+ *  - GNU General Public License Version 2 or later (the "GPL")
+ *    http://www.gnu.org/licenses/gpl.html
+ *
+ *  - GNU Lesser General Public License Version 2.1 or later (the "LGPL")
+ *    http://www.gnu.org/licenses/lgpl.html
+ *
+ *  - Mozilla Public License Version 1.1 or later (the "MPL")
+ *    http://www.mozilla.org/MPL/MPL-1.1.html
+ *
+ * == END LICENSE ==
+ *
+ * @file
+ * CKEditor Module for Drupal 6.x
+ *
+ * This module allows Drupal to replace textarea fields with CKEditor.
+ *
+ * CKEditor is an online rich text editor that can be embedded inside web pages.
+ * It is a WYSIWYG (What You See Is What You Get) editor which means that the
+ * text edited in it looks as similar as possible to the results end users will
+ * see after the document gets published. It brings to the Web popular editing
+ * features found in desktop word processors such as Microsoft Word and
+ * OpenOffice.org Writer. CKEditor is truly lightweight and does not require any
+ * kind of installation on the client computer.
+ */
+
+/**
+ * Hook to register the CKEditor plugin - it would appear in the plugins list on the profile setting page.
+ */
+function hook_ckeditor_plugin() {
+  return array(
+    'plugin_name' => array(
+      // Name of the plugin used to write it.
+      'name' => 'plugin_name',
+      // Description of the plugin - it would be displayed in the plugins management section of profile settings.
+      'desc' => t('Plugin description'),
+      // The full path to the CKEditor plugins directory, with the trailing slash.
+      'path' => drupal_get_path('module', 'my_module') . '/plugin_dir/',
+      'buttons' => array(
+        'button_name' => array(
+          'icon' => 'path to button icon',
+          'label' => 'Button Label',
+        )
+      )
+    )
+  );
+}
+
+/**
+ * Hook to extend CKEditor security allowed tags list.
+ *
+ * This hook is invoked from ckeditor_filter_xss() where text is filtered from potentially insecure tags.
+ */
+function hook_ckeditor_filter_xss_allowed_tags() {
+  // Return an array of additional allowed tags
+}