update release note (#140)

website/release_notes/0_5.md

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+### Release Notes for Milestone 0.5.0 🎉
+
+#### Improvements:
+- **Updated to AutoGen.Net 0.1.0**: The project now utilizes AutoGen.Net version 0.1.0, enhancing performance and features. [Issue #135](https://github.com/LittleLittleCloud/Agent-ChatRoom/issues/135) 🚀
+- **Enhanced README for Template Setup**: Updated the README file to provide clearer instructions on how to get started with the template, making it more user-friendly. [Issue #121](https://github.com/LittleLittleCloud/Agent-ChatRoom/issues/121) 📖
+
+#### Bug Fixes:
+- **Fixed ArgumentOutOfRangeException**: Resolved a critical issue that caused an `ArgumentOutOfRangeException` when users attempted to exit the chatroom. [Issue #129](https://github.com/LittleLittleCloud/Agent-ChatRoom/issues/129) 🐞
+
+#### Documentation:
+- **Integration Guide for AutoGen.Net Agents**: Added documentation detailing how to integrate AutoGen.Net agents into the chatroom, providing users with helpful guidance. [Issue #127](https://github.com/LittleLittleCloud/Agent-ChatRoom/issues/127) 📚
+- **Example for Writing Release Notes**: Documented an example that illustrates how to use ChatRoom.Github for writing effective release notes. [Issue #138](https://github.com/LittleLittleCloud/Agent-ChatRoom/issues/138) ✍️

website/release_notes/toc.yml

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+- name: 0.5.*
+  href: 0_5.md
+
 - name: 0.4.*
   href: 0_4.md