feat: add multi-language support section to README files for English and Chinese

Author: chaxus

readme.md

@@ -6,6 +6,15 @@
 
 A local web-based document editor based on OnlyOffice, allowing you to edit documents directly in your browser without server-side processing, ensuring your privacy and security.
 
+## 🌍 Multi-Language Support
+
+This project supports multiple languages! You can access the editor in different languages:
+
+- 🇺🇸 **English**: [https://ranuts.github.io/document/?locale=en](https://ranuts.github.io/document/?locale=en)
+- 🇨🇳 **中文**: [https://ranuts.github.io/document/?locale=zh](https://ranuts.github.io/document/?locale=zh)
+
+Want to add support for more languages? We'd love your help! Feel free to submit a Pull Request. 😊
+
 ## ✨ Key Features
 
 - 🔒 **Privacy-First**: All document processing happens locally in your browser, with no uploads to any server

readme.zh.md

@@ -6,6 +6,15 @@
 
 基于 OnlyOffice 的本地网页文档编辑器，让您直接在浏览器中编辑文档，无需服务器端处理，保护您的隐私安全。
 
+## 🌍 多语言支持
+
+本项目支持多种语言！您可以使用不同语言访问编辑器：
+
+- 🇺🇸 **English**: [https://ranuts.github.io/document/?locale=en](https://ranuts.github.io/document/?locale=en)
+- 🇨🇳 **中文**: [https://ranuts.github.io/document/?locale=zh](https://ranuts.github.io/document/?locale=zh)
+
+想要添加更多语言支持？非常欢迎您的帮助！欢迎提交 Pull Request。😊
+
 ## ✨ 主要特性
 
 - 🔒 **隐私优先**: 所有文档处理都在浏览器本地进行，不上传到任何服务器