增加GUI AstralET游戏联机工具 (#103)

en/guide/gui/astral_ET.md

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+# AstralET Game Connection Tool
+
+[![GitHub](https://img.shields.io/badge/GitHub-AstralET-blue)](https://github.com/ldoubil/astral)
+
+## Preview
+![manage-step1](/assets/AstralET1.png)
+![manage-step1](/assets/AstralET2.png)
+![manage-step1](/assets/AstralET3.png)
+![manage-step1](/assets/AstralET4.png)
+![manage-step1](/assets/AstralET5.png)
+
+## Tutorial
+
+1. ​**Download and Install**  
+   Visit the [GitHub project page](https://github.com/ldoubil/astral) to download the latest version of AstralET.
+
+2. ​**Launch the Application**  
+   After installation, launch AstralET.
+
+3. ​**Start Connecting**  
+   - Modify your preferred name and room password, then click start (if unable to get IP, try running as administrator or check the firewall - this issue will be resolved in future updates).
+
+4. ​**No Fourth Step**
+   - The remaining features are intuitive and easy to understand.  
+
+## Introduction
+
+AstralET is a lightweight game connection tool developed based on ​**Flutter** and ​**EasyTier**, aiming to provide players with a simple and efficient connection experience.
+
+## Features
+
+- ​**Built-in EasyTier**: EasyTier is directly compiled into AstralET, no additional installation required, and no background processes are retained.  
+- ​**Ready to Use**: Start the application when connecting and close it after finishing, simple and convenient.  
+- ​**Active Maintenance**: The author actively updates, fixing issues and optimizing features at any time (a result of working while browsing the web).
+
+## Contact Us & Feature Suggestions
+
+- ​**QQ Group**: [Join QQ Group](https://qm.qq.com/q/r4VsExDDt6)  
+- ​**GitHub Issues**: [Submit Issues or Suggestions](https://github.com/ldoubil/astral/issues)  
+
+Welcome to provide feedback or feature suggestions, we will continue to improve!