📝 docs(changelog): Create changelog file

Author: NestorDP

CHANGELOG.md

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+# 📜 CPPSerial Changelog
+
+All notable changes to this project will be documented in this file.  
+This format follows the principles of [Keep a Changelog](https://keepachangelog.com/en/1.1.0/)  
+and adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0.html).
+
+---
+
+## [v1.0.0] — 2025-10-21  
+### 🎉 First Stable Release
+
+#### 🧩 Added
+- Modern **C++17 interface** for serial communication on Linux  
+- Support for **custom baud rates**, including non-standard values  
+- Configuration of **data bits, parity, and stop bits**  
+- Exception-based **error handling** for improved safety  
+- Clean **header-only design** for easy inclusion in embedded systems  
+- **Doxygen documentation** and a concise usage example in `README.md`
+
+#### 🐛 Fixed
+- Removed redundant and unsafe `termios` usage  
+- Fixed initialization issues under certain device configurations  
+- Improved internal validation and descriptive error messages
+
+#### ⚙️ Improved
+- Refactored low-level communication layer for better performance  
+- Enhanced naming conventions and code consistency  
+- Improved readability and adherence to C++ best practices
+
+#### 🧾 Documentation
+- Added comments and Doxygen-style headers to all public classes  
+- Provided getting started guide and API overview
+
+#### 🧩 Compatibility
+- ✅ **Linux only**
+- 🧰 Tested on **Ubuntu 24.04**
+- 🧱 Compilers: GCC 11+, Clang 14+
+
+#### ⚖️ License
+- Distributed under **GNU General Public License v3.0 (GPLv3)**  
+  See [LICENSE](./LICENSE) for details.
+
+---
+
+## 🪄 Template for Future Releases
+
+Use this section as a guide for documenting future versions:
+
+```markdown
+## [vX.Y.Z] — YYYY-MM-DD
+### 🚀 Added
+- New feature X
+- Extended support for Y
+
+### 🐛 Fixed
+- Fixed issue with Z
+
+### ⚙️ Improved
+- Performance optimizations in serial read/write
+- Simplified configuration handling
+
+### 🧾 Documentation
+- Updated usage examples and API docs