Add CHANGELOG.md containing release history

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).
+
+## [Unreleased]
+
+### Added
+- SPDX license identifiers (GPL-3.0-or-later) to all source code files.
+- OARS content rating metadata to the AppStream configuration.
+
+### Changed
+- Relicensed the project from MIT to GNU GPLv3 (GPL-3.0-or-later).
+
+### Fixed
+- Fixed a metadata overwrite bug where the media player would clear valid ICY stream metadata.
+- Fixed a DBus crash (segmentation fault) under KDE Plasma Wayland by making notification requests fully asynchronous.
+- Fixed a regex parser bug that failed to extract stream titles containing apostrophes.
+
+---
+
+## [1.0.1] - 2026-05-22
+
+### Added
+- Added debounced online search for radio stations.
+
+### Changed
+- Migrated playback engine from the legacy Phonon backend to modern QtMultimedia.
+
+### Fixed
+- Fixed a crash (segmentation fault) inside `NotificationManager`.
+
+---
+
+## [1.0.0-beta.1] - 2026-05-20
+
+### Added
+- Initial public beta release of BearWave.
+- C++ state and playback engine with system tray integration.
+- Kirigami/QML user interface with compact and non-compact views.
+- MPRIS integration for desktop media keys and lock screen controls.
+- Persistent favorites and volume state settings.
+- Cover art fetcher integration.