docs: add initial changelog file

Author: dido18

docs/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/)
+
+## [Unreleased]
+
+### Added
+
+### Changed
+
+### Deprecated
+
+### Removed
+
+### Fixed
+
+### Security
+
+## [0.6.7] - 2025-11-10
+
+### Added
+
+- Flash sketch in ram (#12)
+- Return `config_variables` field in `/apps/:id/bricks` and `apps/:id/bricks/:id` (#18)
+- Add brick details completions (#54)
+
+### Fixed
+
+- Install a library missing from local library-index (#50)
+- Remove the `variable default value cannot be empty` error when a brick is added to an app (#44)
+
+## [0.6.6] - 2025-11-03
+
+### Added
+
+- Improve `arduino-app-cli restart` command (#37)
+- Return adb stdout/err in case of error (#40)
+- Add `used_by_apps` field to the `GET /v1/bricks/{brickID}` (#30()
+
+### Fixed
+
+- Check websocket origin check (fixes serial monitor on Windows) (#39)
+- Use a valid origin in `GET /v1/monitor/ws` (#41)
+- Remove `Requires` from the systemd `arduino-app-cli.service` (#34)
+
+## [0.6.5] - 2025-10-27
+
+### Removed
+
+- Remove the `arduino-app-cli board` sub-command (#27)
+- Remove the internal zephyr core (#28)
+
+## [0.6.3] - 2025-10-27 [YANKED]
+
+The index of the zephyr core is wrong, so the update to the next version fails.
+
+## [0.6.2]