CHANGELOG.md: add v0.0.2 and v0.0.1 changes

Signed-off-by: Kir Kolyshkin <[email protected]>

Author: kolyshkin

CHANGELOG.md

@@ -0,0 +1,37 @@
+# Changelog
+
+This file documents all notable changes made to this project since it was
+split out of runc repository.
+
+The format is based on [Keep a Changelog](https://keepachangelog.com/en/1.1.0/),
+and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0.html).
+
+## [Unreleased]
+
+[Unreleased]: https://github.com/opencontainers/cgroups/compare/v0.0.2...HEAD
+
+## [0.0.2] - 2005-04-25
+
+### Added
+* CPU burst stats. (#11)
+* CI infrastructure. (#3, #6)
+* CI: add nolintlint linter. (#10)
+
+### Changed
+* Mark some fileds with `omitempty` JSON attribute. (#9)
+* Modernize code by using new Go features. (#13)
+* CI: switch to golangci-lint v2. (#12)
+
+### Fixed
+* systemd: write rounded CPU quota to cgroupfs. (#4)
+
+[0.0.2]: https://github.com/opencontainers/cgroups/compare/v0.0.1...v0.0.2
+
+## 0.0.1 - 2025-02-28
+
+### Added
+
+* This is an initial release of the code after splitting it from the runc repository,
+  according to the [proposal].
+
+[proposal]: https://github.com/opencontainers/tob/blob/main/proposals/cgroups.md