Add a changelog

Changelog.md

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+# Changelog
+
+## [Unreleased]
+
+- Your change here.
+
+[Unreleased]: https://github.com/samsonjs/AsyncMonitor/compare/0.3.1...HEAD
+
+## [0.3.1] - 2025-05-25
+
+### Changed
+- Updated documentation in Readme.md
+
+[0.3.1]: https://github.com/samsonjs/AsyncMonitor/compare/0.3...0.3.1
+
+## [0.3] - 2025-05-25
+
+### Added
+- Support for iOS 17 and macOS 14 (expanded platform compatibility)
+- Legacy initializers and monitor methods with Sendable requirements for iOS 17+ compatibility
+- Backward compatibility layer for actor isolation features
+
+### Changed
+- Enhanced AsyncMonitor class with dual initializer pattern for different iOS versions
+- Improved AsyncSequence extensions with version-specific monitor methods
+- Updated NSObject+AsyncKVO implementation for broader platform support
+
+[0.3]: https://github.com/samsonjs/AsyncMonitor/compare/0.2.1...0.3
+
+## [0.2.1] - 2025-04-26
+
+### Changed
+- **Breaking**: Refactored KVO monitoring API
+  - Split `values` method into separate `values(for:)` method that returns AsyncStream
+  - Added `monitorValues(for:)` convenience method that combines values observation with monitoring
+- Replaced `TokenLocker` with `ValueLocker` for improved value management
+
+### Added
+- Enhanced test coverage for NSObject+AsyncKVO functionality
+- Additional test cases for async cancellable behavior
+
+[0.2.1]: https://github.com/samsonjs/AsyncMonitor/compare/0.2...0.2.1
+
+## [0.2] - 2025-04-26
+
+### Changed
+- Version bump to 0.2
+
+[0.2]: https://github.com/samsonjs/AsyncMonitor/compare/0.1.1...0.2
+
+## [0.1.1] - 2025-04-25
+
+### Changed
+- Updated minimum iOS platform requirement to 18.0
+- Removed main actor restrictions from public API
+
+### Added
+- Comprehensive documentation comments on public API
+- Enhanced README with detailed usage examples and patterns
+- Expanded test suite coverage
+
+[0.1.1]: https://github.com/samsonjs/AsyncMonitor/compare/0.1...0.1.1
+
+## [0.1] - 2025-04-25
+
+### Added
+- Initial release of AsyncMonitor
+- Core `AsyncMonitor` class for wrapping async sequence observation in manageable Tasks
+- `AsyncCancellable` protocol and `AnyAsyncCancellable` type-eraser for uniform cancellation
+- AsyncSequence extensions with `.monitor()` convenience methods
+- KVO integration via `NSObject+AsyncKVO` extension
+- Support for context-aware monitoring to prevent reference cycles
+- Swift Testing framework integration
+- Comprehensive test suite
+- Documentation and usage examples
+
+[0.1]: https://github.com/samsonjs/AsyncMonitor/releases/tag/0.1