docs: add "CHANGELOG.md" file (#10)

Closes #9

Author: andrei-cristea

CHANGELOG.md

@@ -0,0 +1,22 @@
+# 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).
+
+## [Unreleased]
+### Added
+- "CHANGELOG.md" file (issue [#9]).
+- CI: Forbid the publication of a version already released (issue [#7]).
+### Changed
+- Description of the management of invalidated cards in "CalypsoCard (issue [#6]).
+
+## [1.0.0] - 2021-10-06
+This is the initial release.
+
+[unreleased]: https://github.com/calypsonet/calypsonet-terminal-calypso-java-api/compare/1.0.0...HEAD
+[1.0.0]: https://github.com/calypsonet/calypsonet-terminal-calypso-java-api/releases/tag/1.0.0
+
+[#9]: https://github.com/calypsonet/calypsonet-terminal-calypso-java-api/issues/9
+[#7]: https://github.com/calypsonet/calypsonet-terminal-calypso-java-api/issues/7
+[#6]: https://github.com/calypsonet/calypsonet-terminal-calypso-java-api/issues/6