[chore] add repository sponsorship links

.github/FUNDING.yml

@@ -0,0 +1,3 @@
+github: kunkundi
+ko_fi: kunkundi
+custom: ["https://afdian.com/a/kunkundi"]

README.md

@@ -12,6 +12,7 @@
 [![Build](https://github.com/kunkundi/crossdesk/actions/workflows/build.yml/badge.svg)](https://github.com/kunkundi/crossdesk/actions/workflows/build.yml)
 [![License: GPL v3](https://img.shields.io/badge/license-GPL--3.0-blue)](LICENSE)
 [![Stars](https://img.shields.io/github/stars/kunkundi/crossdesk?style=social)](https://github.com/kunkundi/crossdesk/stargazers)
+[![Sponsor](https://img.shields.io/badge/Sponsor-EA4AAA?logo=githubsponsors&logoColor=white)](#sponsor)
 
 </div>
 
@@ -334,6 +335,14 @@ Windows 的“开机自启”在当前用户登录后启动客户端。安装版
 - [常见问题](docs/FAQ.md)：连接失败、黑屏、文件位置与编译问题。
 - [提交问题](https://github.com/kunkundi/crossdesk/issues)：请附上两端系统、客户端版本、连接方式和可复现步骤。
 
+<a id="sponsor"></a>
+
+## 支持 CrossDesk
+
+如果 CrossDesk 对你有帮助，欢迎通过以下平台赞助，支持项目的持续开发、跨平台测试与日常维护。感谢你的支持！
+
+[爱发电](https://afdian.com/a/kunkundi) · [Ko-fi](https://ko-fi.com/kunkundi) · [GitHub Sponsors](https://github.com/sponsors/kunkundi)
+
 ## 致谢与许可
 
 感谢 [HelloGitHub](https://hellogithub.com/)、[阮一峰的科技爱好者周刊](https://github.com/ruanyf/weekly) 与 [LinuxDo](https://linux.do) 社区的推荐、交流与支持。

README_EN.md

@@ -12,6 +12,7 @@
 [![Build](https://github.com/kunkundi/crossdesk/actions/workflows/build.yml/badge.svg)](https://github.com/kunkundi/crossdesk/actions/workflows/build.yml)
 [![License: GPL v3](https://img.shields.io/badge/license-GPL--3.0-blue)](LICENSE)
 [![Stars](https://img.shields.io/github/stars/kunkundi/crossdesk?style=social)](https://github.com/kunkundi/crossdesk/stargazers)
+[![Sponsor](https://img.shields.io/badge/Sponsor-EA4AAA?logo=githubsponsors&logoColor=white)](#sponsor)
 
 </div>
 
@@ -326,6 +327,14 @@ Host your own signaling and TURN services, then enter their connection details u
 - [FAQ](docs/FAQ.md#english): connection failures, blank video, received files, and build issues.
 - [Report an issue](https://github.com/kunkundi/crossdesk/issues): include both operating systems, client versions, connection mode, and reproduction steps.
 
+<a id="sponsor"></a>
+
+## Support CrossDesk
+
+If CrossDesk is useful to you, consider sponsoring its continued development, cross-platform testing, and maintenance through one of the platforms below. Thank you for your support!
+
+[Ko-fi](https://ko-fi.com/kunkundi) · [GitHub Sponsors](https://github.com/sponsors/kunkundi) · [AFDIAN](https://afdian.com/a/kunkundi)
+
 ## Acknowledgements and license
 
 Thanks to [HelloGitHub](https://hellogithub.com/), [Ruanyf Weekly](https://github.com/ruanyf/weekly), and the [LinuxDo](https://linux.do) community for featuring CrossDesk and contributing feedback.