docs: add initial changelog with notable changes and version history

Author: dido18

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
+
+- Improve the help message of `arduino-app-cli` (#61)
+- Add `arduino-avahi-serial.service` systemd service that runs once to add the `serial_number` to the avahi daemon (#48)
+- Add the `daemon_version` field to the `arduino-app-cli version` command (#49)
+- Add `arduino-app-cli app clean-cache <app-id>` command (#59)
+- pkg/board/board: expose the `serial_number` in network mode (#63)
+- pkg/board/remote/adb: return `failed to create command` error when `GetCmd` fails (#79)
+- Update `arduino-cli` dependencies (#86)
+- Add `code` field with `NO_INTERNET_CONNECTION`, `OPERATION_IN_PROGRESS` and `UNKNOWN_ERROR` values in the update handlers and CLI (#62)
+- Refactor README.md and contribution guidelines (#58)
+- Return detailed `error running needrestart command` error information during updates (#95)
+
+### Removed
+
+- Remove `arduino-app-cli app ps` command (#65)
+
+### Fixed
+
+- pkg/board/remote/adb: fix zombie process in adb that resulted in `fork failed: resource temporarily unavailable` error (#81)
+- Check if the app is running/starting before stopping it in `arduino-app-cli app stop` and `DELETE /v1/apps/{appID}` (#84)
+- Allow missing required variables when adding a brick (#74)
+
+## [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 libraries missing from local library-index (#50)
+- Remove the `variable default value cannot be empty` error when adding a brick 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
+
+- Fix websocket origin validation (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 zephyr core index contains errors, causing updates to the next version to fail.