docs(readme): Add contributors section to README files

- Added new "Contributors" section to both README.md and README_EN.md
- Included GitHub contributors graph image card in both files
- Highlighted community contribution and appreciation
- Improved project documentation with recognition of contributors

README.md

@@ -744,6 +744,12 @@ pnpm lint
 - 感谢开源社区的无私分享精神
 - 以及所有本项目所使用的开源软件的作者们！
 
+## <20> 贡献者
+
+感谢以下优秀的贡献者们，他们让 XCodeReviewer 更强大！
+
+[<image-card alt="Contributors" src="https://github.com/lintsinghua/XCodeReviewer/graphs/contributors" ></image-card>](https://github.com/lintsinghua/XCodeReviewer/graphs/contributors)
+
 ## 📞 联系我们
 
 - **项目链接**: [https://github.com/lintsinghua/XCodeReviewer](https://github.com/lintsinghua/XCodeReviewer)

README_EN.md

@@ -745,6 +745,12 @@ We warmly welcome all forms of contributions! Whether it's submitting issues, cr
 - Thanks to the open source community for their selfless sharing
 - And all the authors of open source software used in this project!
 
+## 👥 Contributors
+
+Thanks to these amazing contributors who make XCodeReviewer better!
+
+[<image-card alt="Contributors" src="https://github.com/lintsinghua/XCodeReviewer/graphs/contributors" ></image-card>](https://github.com/lintsinghua/XCodeReviewer/graphs/contributors)
+
 ## 📞 Contact Us
 
 - **Project Link**: [https://github.com/lintsinghua/XCodeReviewer](https://github.com/lintsinghua/XCodeReviewer)