Add changelog

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/1.1.0/),
+and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0.html).
+
+## [Unreleased]
+
+### Changed
+
+- Omit first child elements ([#27](https://github.com/dobidi/markdown-it-bidi/pull/27))
+
+## [0.1.0] - 2022-02-11
+
+The initial release
+
+[unreleased]: https://github.com/dobidi/markdown-it-bidi/compare/v0.1.0...HEAD
+[0.1.0]: https://github.com/dobidi/markdown-it-bidi/releases/tag/v0.1.0