update repository files

README.md

@@ -16,6 +16,10 @@ For complete source code access, please contact the author at: lostjaychi@gmail.
 - Support for various document formats
 - Asynchronous processing for better performance
 
+## Demo Video
+
+Watch the demo video on Bilibili: [Baidu Wenku Downloader Demo](https://www.bilibili.com/video/BV1FhMnzwEeK)
+
 ## How to Find Document ID
 
 The document ID is a unique identifier in the Baidu Wenku URL. For example, in the URL:

README_zh.md

@@ -14,6 +14,10 @@
 - 支持多种文档格式
 - 异步处理提升性能
 
+## 演示视频
+
+观看 B 站演示视频：[百度文库下载器演示](https://www.bilibili.com/video/BV1FhMnzwEeK)
+
 ## 如何查找文档 ID
 
 文档 ID 是百度文库 URL 中的唯一标识符。例如，在 URL：