the docuemnt explains API Header and Overview

Change-Id: I8b3c7dcf36f4ba5b3918439662d3168f0b3ac6ee

diff --git a/include/download_doc.h b/include/download_doc.h
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+/*
+ * Copyright (c) 2011 Samsung Electronics Co., Ltd All Rights Reserved
+ *
+ * Licensed under the Apache License, Version 2.0 (the License);
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ * http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an AS IS BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+#ifndef __TIZEN_WEB_DOWNLOAD_DOC_H__
+#define __TIZEN_WEB_DOWNLOAD_DOC_H__
+
+/**
+ * @ingroup CAPI_WEB_FRAMEWORK
+ * @defgroup CAPI_WEB_DOWNLOAD_MODULE Download
+ * @brief  The DOWNLOAD API provides functions to create and manage one or more download requests.
+ *
+ * @section CAPI_WEB_DOWNLOAD_MODULE_HEADER Required Header
+ *   \#include <download.h>
+ *
+ * @section CAPI_WEB_DOWNLOAD_MODULE_OVERVIEW Overview
+ * The DOWNLOAD API provides functions to create and manage one or more download requests.
+ *
+ * Major features :
+ * - After getting download_id from download_create(), other APIs use download_id as parameter.
+ * - Even if the device is off, download_id is available for 48 hours if user did't call download_destroy().
+ * - support the callback that called whenever changed the status of download.
+ * - Even if the client process is terminated, download is going on.
+ *   If wanna stop a download, download_cancel() or download_destroy() should be called.
+ *
+ */
+
+#endif /* __TIZEN_WEB_DOWNLOAD_DOC_H__ */