Add contributor list via contributors.md

CONTRIBUTORS.md

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+# Contributors
+
+## Special thanks to all the people who have helped this project so far:
+> These individuals have dedicated their time and expertise to improve this project. We are deeply grateful for their contributions.
+
+| Name | GitHub Handle | Organization | Features | Roadmap Lead | Additional  Information |
+|---|---|---|---|---|---|
+| Qingyun Wu | [qingyun-wu](https://github.com/qingyun-wu) | Penn State University | all, alt-models, autobuilder | Yes | Available most of the time (US Eastern Time) |
+| Chi Wang | [sonichi](https://github.com/sonichi) | - | all | Yes | |
+| Li Jiang | [thinkall](https://github.com/thinkall) | Microsoft | rag, autobuilder, group chat | Yes | [Issue #1657](https://github.com/microsoft/autogen/issues/1657) - Beijing, GMT+8 |
+| Mark Sze | [marklysze](https://github.com/marklysze) | - | alt-models, group chat | No | Generally available (Sydney, AU time) - Group Chat "auto" speaker selection |
+| Hrushikesh Dokala | [Hk669](https://github.com/Hk669) | - | alt-models, swebench, logging, rag | No | [Issue #2946](https://github.com/microsoft/autogen/issues/2946), [Pull Request #2933](https://github.com/microsoft/autogen/pull/2933) - Available most of the time (India, GMT+5:30) |
+| Jiale Liu | [LeoLjl](https://github.com/LeoLjl) | Penn State University | autobuild, group chat | No | |
+| Shaokun Zhang | [skzhang1](https://github.com/skzhang1) | Penn State University | AgentOptimizer, Teachability            | Yes | [Issue #521](https://github.com/microsoft/autogen/issues/521)                         |
+| Rajan Chari | [rajan-chari](https://github.com/rajan-chari) | Microsoft Research | CAP, Survey of other frameworks | No | |
+| Victor Dibia | [victordibia](https://github.com/victordibia) | Microsoft Research | autogenstudio | Yes | [Issue #737](https://github.com/microsoft/autogen/issues/737) |
+| Yixuan Zhai | [randombet](https://github.com/randombet) | Meta | group chat, sequential_chats, rag       | No | |
+| Xiaoyun Zhang | [LittleLittleCloud](https://github.com/LittleLittleCloud) | Microsoft | AutoGen.Net, group chat | Yes | [Backlog - AutoGen.Net](https://github.com/microsoft/autogen/issues) - Available most of the time (PST) |
+| Yiran Wu | [yiranwu0](https://github.com/yiranwu0) | Penn State University | alt-models, group chat, logging | Yes | |
+| Beibin Li | [BeibinLi](https://github.com/BeibinLi) | Microsoft Research | alt-models | Yes | |
+
+
+## I would like to join this list. How can I help the project?
+> We're always looking for new contributors to join our team and help improve the project. For more information, please refer to our [CONTRIBUTING](CONTRIBUTING.md) guide.
+
+
+## Are you missing from this list?
+> Please open a PR to help us fix this.
+
+
+## Acknowledgements
+This template was adapted from [GitHub Template Guide](https://github.com/cezaraugusto/github-template-guidelines/blob/master/.github/CONTRIBUTORS.md) by [cezaraugusto](https://github.com/cezaraugusto).