docs: add changelog to project

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/),
+and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0.html).
+
+## [Unreleased]
+
+<!--
+RELEASE TEMPLATE
+======================
+
+## [0.0.0] - 2024-01-01
+
+### Added
+
+- Add support to open README or index by default
+
+### Fixed
+
+- Fix missing logo
+
+### Changed
+
+- Upgrade dependencie tty-markdown
+
+### Removed
+
+- Identical links assigned in each translation file
+
+-->
+
+
+## [0.4.0] - 2024-01-18
+
+### Added
+
+- Add support to open README.md or index.md by default
+
+
+[unreleased]: https://github.com/dvinciguerra/mdcat/compare/v0.4.0...HEAD
+[0.4.0]: https://github.com/dvinciguerra/mdcat/compare/v0.3.0...v0.4.0