Add CHANGELOG.md file

Author: thefeqy

CHANGELOG.md

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+# 📜 Changelog
+
+All notable changes to `GrokPHP/Client` will be documented in this file.  
+This project follows [Semantic Versioning](https://semver.org/).
+
+---
+
+## [v1.1.1] - 2025-02-11
+### 🔧 Improvements
+- Refactored code formatting for better readability and maintainability.
+- Implemented **GitHub Actions CI** to run tests automatically on each push to the `main` branch.
+
+---
+
+## [v1.1.0] - 2025-02-07
+### 🚀 Enhancements
+- **Upgraded to version `1.1.0`** with internal improvements and stability fixes.
+
+---
+
+## [v1.0.0] - 2025-02-06
+### 🎉 Initial Release
+- **🚀 Launched `GrokPHP/Client` v1.0.0** – a robust, framework-agnostic PHP client for interacting with Grok AI APIs.
+
+---
+
+### 📌 Notes
+- For detailed usage, refer to the [README.md](README.md).
+- Found an issue? Report it on [GitHub Issues](https://github.com/grok-php/client/issues).