docs: add changelog for upcoming v0.0.3

CHANGELOG.md

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+# Changelog
+
+<!-- markdownlint-disable MD024 -->
+
+All notable changes to this project will be documented in this file.
+
+The format follows conventional changelog categories.
+
+## [Unreleased]
+
+## [v0.0.3] - 2026-03-29
+
+### Added
+
+- Added comprehensive project documentation in README.
+- Added release process documentation in docs/RELEASING.md.
+- Added repository changelog file.
+- Added test suite based on GoConvey.
+- Added coverage gate script: scripts/check-coverage.sh.
+- Added release notes generator script: scripts/generate-release-notes.sh.
+- Added tag-based Drone release flow with artifact publishing.
+
+### Changed
+
+- Updated Drone pipeline to run on push and tag events.
+- Extended CI quality gates with go vet, coverage reporting, and govulncheck.
+- Improved markdown quality across project documentation.
+- Improved Definition of Done formatting and lint compliance.
+
+### Fixed
+
+- Fixed shell script index modes to be executable (100755).
+- Fixed markdownlint violations in README and documentation files.
+
+## [v0.0.2] - 2021-03-03
+
+### Changed
+
+- Updated libraries.
+- Added build configuration.
+- Updated README.
+
+## [v0.0.1] - 2021-03-03
+
+### Added
+
+- Initial project setup.
+
+[Unreleased]: https://scm.yoorie.de/git/go-lib/gelf/compare/v0.0.3...master
+[v0.0.3]: https://scm.yoorie.de/git/go-lib/gelf/compare/v0.0.2...v0.0.3
+[v0.0.2]: https://scm.yoorie.de/git/go-lib/gelf/compare/v0.0.1...v0.0.2
+[v0.0.1]: https://scm.yoorie.de/git/go-lib/gelf/releases/tag/v0.0.1