docs: add changelog

CHANGELOG.md

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+# Changelog
+
+All notable changes to this project will be documented in this file.
+
+The format is based on [Keep a Changelog](https://keepachangelog.com/en/1.1.0/),
+and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0.html).
+
+## [Unreleased]
+
+## [0.2.0] - 2025-12-13
+
+### Added
+
+- Migration to clean-like architecture
+- Improved Surface management and configuration
+- Improved Event handling system
+- Multi-surface support
+- Runtime and declarative configuration options
+- Popup initial support using XDG_Popup protocol
+- New ergonomic APIs
+- New examples
+
+### Changed
+
+- Callback registration is now chainable
+- Surface identifier refactoring for better API
+
+### Fixed
+
+- Documentation improvements and updates
+
+## [0.1.0] - Initial development version