docs: Add CHANGELOG.md

- Create changelog following Keep a Changelog format
- Document changes for v1.0.3 through v1.0.5
- Add links to release tags

Author: PeterVinter

CHANGELOG.md

@@ -0,0 +1,43 @@
+# 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).
+
+## [v1.0.5] - 2024-11-18
+
+### Added
+- Comprehensive GitHub CLI workflow guide in `docs/github_cli_workflow.md`
+- Command reference and examples for GitHub CLI usage
+- Common workflows and troubleshooting documentation
+
+### Changed
+- Updated README.md with reference to GitHub CLI workflow guide
+
+## [v1.0.4] - 2024-11-18
+
+### Added
+- Project Management section in README.md
+- Development workflow documentation
+- Issue classification system
+- Project board organization details
+
+## [v1.0.3] - 2024-11-18
+
+### Added
+- Initial release of Docker Safe Shutdown
+- Core shell scripts for container management
+- Automated GitHub Actions release workflow
+- Basic documentation (README.md, CONTRIBUTING.md, SECURITY.md)
+- MIT License
+- Issue and PR templates
+- ShellCheck integration
+
+### Security
+- Implemented security reporting process
+- Added recommended privileges documentation
+
+[v1.0.5]: https://github.com/PeterVinter/linux_docker_container_shutdown/releases/tag/v1.0.5
+[v1.0.4]: https://github.com/PeterVinter/linux_docker_container_shutdown/releases/tag/v1.0.4
+[v1.0.3]: https://github.com/PeterVinter/linux_docker_container_shutdown/releases/tag/v1.0.3