doc: 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]
+
+### Added
+
+- Add a void frontend (#33)
+- Implement a config file (#31)
+
+### Fixed
+
+- Replace echap key by pause key since the purpose of the pause key is not related to input field (#30)
+- Fix problem of not human character input (#29)
+
+## [0.2.0] - 2023-05-09
+
+### Added
+
+- Implement the initial binary application
+- (lib) Implement a cursor
+- (lib) Each node hold his key (#16)
+- (lib) Each node hold his depth on the tree
+
+### Change
+
+- (lib) Rename bst to text_buffer
+
+## [0.1.1] 2023-04-28
+
+### Added
+
+- (lib) Implement the initial library