Create CHANGELOG.md

Author: sormuras

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/1.0.0/).
+
+This project uses tags and branches for [release management](https://docs.github.com/en/actions/creating-actions/about-custom-actions#using-tags-for-release-management).
+
+
+## [Unreleased]
+
+_nothing notable, yet_
+
+## [1.2.0] - 2022-08-08
+### Added
+- Tool `jextract` to the list of Early-Access releases
+- New `install-as-version` input
+
+## [1.1.2] - 2022-06-10
+### Added
+- Java `20` to the list of Early-Access releases
+
+## [1.1.1] - 2022-05-03
+### Fixed
+- Version string parsing when update segment is present
+
+## [1.1.0] - 2022-04-01
+### Changed
+- Version of `setup-java` to `v3`
+- Default value of `release` input to Java `18`
+
+## [1.0.0] - 2014-05-31
+### Added
+- Initial Release
+
+[Unreleased]: https://github.com/oracle-actions/setup-java/compare/v1.2.0...HEAD
+[1.2.0]: https://github.com/olivierlacan/keep-a-changelog/compare/v1.1.2...v1.2.0
+[1.1.2]: https://github.com/olivierlacan/keep-a-changelog/compare/v1.1.1...v1.1.2
+[1.1.1]: https://github.com/olivierlacan/keep-a-changelog/compare/v1.1.0...v1.1.1
+[1.1.0]: https://github.com/olivierlacan/keep-a-changelog/compare/v1.0.0...v1.1.0
+[1.0.0]: https://github.com/oracle-actions/setup-java/releases/tag/v1.0.0