Add changelog

Author: meech-ward

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/1.0.0/),
+and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0.html).
+
+## [0.2.0] - 2025-03-07
+
+### Added
+- New documentation in `Sources/AsyncCoreBluetooth/AsyncCoreBluetooth.docc` ([2fea786](https://github.com/meech-ward/AsyncCoreBluetooth/commit/2fea7860a82112ca6fa8afa2b130239674761c81))
+
+### Changed
+- Make sure all characteristic continuations are canceled on peripheral disconnect
+- Make sure notifications can't be enabled or disabled if they are already in that state
+- Make data for read and notify not optional ([78629a6](https://github.com/meech-ward/AsyncCoreBluetooth/commit/78629a694a84165df5959ff916ea564c86bfdfd4))
+- Make sure a new peripheral actor is created for each new peripheral instance
+
+### Fixed
+- Remove nonisolated lazy property from Peripheral actor
+
+## [0.1.x] - 2024-XX-XX
+
+- Initial releases with core functionality