Add changelog file (#51)

Author: kvch

CHANGELOG.md

@@ -0,0 +1,82 @@
+# Change Log
+All notable changes to this project will be documented in this file.
+This project adheres to [Semantic Versioning](http://semver.org/).
+
+## [Unreleased]
+
+### Added
+
+### Changed
+
+### Deprecated
+
+### Removed
+
+### Fixed
+
+## [0.2.4]
+
+### Fixed
+
+- Include group write permission in runtime directories. #49
+- Fix keystore secrets parsing when values contain commas. #50
+
+## [0.2.3]
+
+### Added
+
+- Add flatten keys functionality to `mapstr`. #45
+
+## [0.2.2]
+
+### Added
+
+- Extracted `dialers` helpers from Metricbeat. #44
+
+## [0.2.0]
+
+### Added
+
+- Pick changes from `tlscommon`. #41
+- Extracted `monitoring/report/buffer`. #42
+
+## [0.1.2]
+
+### Added
+
+- Extracted `kibana.Client`. #32
+- Extracted `opt` and `transform`. #33
+- Extracted `match` and `datetime`. #32
+- Port kibana and apm changes. #35
+-  Extract function `SyncParent` to reuse in elastic agent. #36
+
+## [0.1.1]
+
+### Fixed
+
+- Make linting compatible with older Git. #22
+
+## [0.1.0]
+
+### Added
+
+- Extracted `common.Config`. #3
+- Extracted `common.MapStr`. #13
+- Extracted `cloudid`. #14
+- Extracted `atomic`. #15
+- Extracted `api`, `api/npipe` and `monitoring`. #17
+- Moved `cfgwarn` to `logp/cfgwarn`. #18
+- Extracted `keystore`. #20
+- Extracted `tlscommon`. #19
+- Extracted `transport` and `testing`. #21
+- Extracted `service`. #22
+
+[Unreleased]: https://github.com/elastic/elastic-agent-libs/compare/v0.2.4...HEAD
+[0.2.4]: https://github.com/elastic/elastic-agent-libs/compare/v0.2.3...v0.2.4
+[0.2.3]: https://github.com/elastic/elastic-agent-libs/compare/v0.2.2...v0.2.3
+[0.2.2]: https://github.com/elastic/elastic-agent-libs/compare/v0.2.1...v0.2.2
+[0.2.1]: https://github.com/elastic/elastic-agent-libs/compare/v0.2.0...v0.2.1
+[0.2.0]: https://github.com/elastic/elastic-agent-libs/compare/v0.1.2...v0.2.0
+[0.1.2]: https://github.com/elastic/elastic-agent-libs/compare/v0.1.1...v0.1.2
+[0.1.1]: https://github.com/elastic/elastic-agent-libs/compare/v0.1.0...v0.1.1
+[0.1.0]: https://github.com/elastic/elastic-agent-libs/compare/v0.0.0...v0.1.0