add changelog (#546)

CHANGELOG.md

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+# Changelog of `tabularray` package
+
+All notable changes to this project will be documented in this file.
+The format is based on [Keep a Changelog](https://keepachangelog.com).
+
+## [Unreleased]
+
+### Added
+
+- evaluate inner specifications with `functional` library ([#270])
+- load `tabularray` libraries in external files ([#532])
+
+### Changed
+
+### Deprecated
+
+### Fixed
+
+### Removed
+
+- remove deprecated inner key `verb` ([#530])
+
+## [v2024A] - 2024-02-16
+
+## [v2023A] - 2023-03-01
+
+## [v2022D] - 2022-11-01
+
+## [v2022C] - 2022-07-01
+
+## [v2022B] - 2022-06-01
+
+## [v2022A] - 2022-03-01
+
+## [v2021Q] - 2021-12-01
+
+## [v2021P] - 2021-10-01
+
+## [v2021N] - 2021-09-01
+
+## [v2021M] - 2021-08-01
+
+## [v2021L] - 2021-07-01
+
+## [v2021K] - 2021-06-05
+
+## [v2021J] - 2021-05-25
+
+## v2021H - 2021-05-13
+
+[#270]: https://github.com/lvjr/tabularray/issues/270
+[#530]: https://github.com/lvjr/tabularray/issues/530
+[#532]: https://github.com/lvjr/tabularray/issues/532
+
+[Unreleased]: https://github.com/lvjr/tabularray/compare/2024A...HEAD
+[v2024A]: https://github.com/lvjr/tabularray/compare/2023A...2024A
+[v2023A]: https://github.com/lvjr/tabularray/compare/2022D...2023A
+[v2022D]: https://github.com/lvjr/tabularray/compare/2022C...2022D
+[v2022C]: https://github.com/lvjr/tabularray/compare/2022B...2022C
+[v2022B]: https://github.com/lvjr/tabularray/compare/2022A...2022B
+[v2022A]: https://github.com/lvjr/tabularray/compare/2021Q...2022A
+[v2021Q]: https://github.com/lvjr/tabularray/compare/2021P...2021Q
+[v2021P]: https://github.com/lvjr/tabularray/compare/2021N...2021P
+[v2021N]: https://github.com/lvjr/tabularray/compare/2021M...2021N
+[v2021M]: https://github.com/lvjr/tabularray/compare/2021L...2021M
+[v2021L]: https://github.com/lvjr/tabularray/compare/2021K...2021L
+[v2021K]: https://github.com/lvjr/tabularray/compare/2021J...2021K
+[v2021J]: https://github.com/lvjr/tabularray/compare/2021H...2021J