update: 更新文件 README.md

Signed-off-by: VampireAchao <[email protected]>

Author: VampireAchao

README.md

@@ -40,6 +40,14 @@ v：Cizai_
  [仓库地址](https://gitee.com/dromara/stream-query)
  [视频教程](https://www.bilibili.com/video/BV1UP411F7Ai)
 
+文档备用地址：
+
+https://stream-query-docs-vampireachaos-projects.vercel.app/
+
+https://stream-query-docs-git-site-v2-vampireachaos-projects.vercel.app/
+
+https://stream-query-docs.vercel.app/
+
 ## 📦安装
 
 ### 🍊Maven