Add a changelog

Changelog.md

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+# Changelog
+
+## [Unreleased]
+
+- Your change here.
+
+[Unreleased]: https://github.com/samsonjs/NotificationSmuggler/compare/0.2.1...HEAD
+
+## [0.2.1] - 2025-06-06
+
+[Compare with 0.2.0](https://github.com/samsonjs/NotificationSmuggler/compare/0.2.0...0.2.1)
+
+### Added
+- Support for optional object parameter in notification posting
+- Comprehensive DocC documentation with examples and best practices
+- Enhanced API documentation with usage examples
+
+### Changed
+- Improved documentation throughout the codebase
+- Enhanced test coverage for new functionality
+
+## [0.2.0] - 2025-06-06
+
+[Compare with 0.1.2](https://github.com/samsonjs/NotificationSmuggler/compare/0.1.2...0.2.0)
+
+### Added
+- [#1](https://github.com/samsonjs/NotificationSmuggler/pull/1): `NotificationCenter.smuggle` extension method for improved ergonomics - [@samsonjs](https://github.com/samsonjs).
+- Better API for posting notifications directly from NotificationCenter
+
+### Changed
+- Improved logging using `os.log` instead of `NSLog`
+- Enhanced overall package documentation
+
+## [0.1.2] - 2025-04-29
+
+[Compare with 0.1.1](https://github.com/samsonjs/NotificationSmuggler/compare/0.1.1...0.1.2)
+
+### Changed
+- Updated documentation and version references
+
+## [0.1.1] - 2025-04-29
+
+[Compare with 0.1.0](https://github.com/samsonjs/NotificationSmuggler/compare/0.1.0...0.1.1)
+
+### Changed
+- Fixed deployment targets for iOS 18.0+ and macOS 15.0+
+- Updated README with comprehensive usage examples and documentation
+
+## [0.1.0] - 2025-04-29
+
+### Added
+- Initial release of NotificationSmuggler
+- `Smuggled` protocol for type-safe notification handling
+- `Notification` and `NotificationCenter` extensions for smuggling notifications
+- Support for async/await and Combine notification observation
+- Swift 6 concurrency support with `Sendable` conformance
+- Comprehensive test suite using Swift Testing framework
+- iOS 18.0+ and macOS 15.0+ platform support