docs: add CHANGELOG

CHANGELOG.md

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+# Klotski 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
+
+- Automatically generate metadata in header file.
+
+- New `analyse` module for analyzing BFS graph structures.
+
+- More test suites and performance benchmark suites.
+
+- More Python and Rust interfaces.
+
+### Changed
+
+- Performance optimization of some functions.
+
+- Internal structure and interfaces adjustment of core.
+
+- Using `Layout` instead of `CommonCode` in external interfaces.
+
+### Fixed
+
+- Avoid compiling C++ code when building on `docs.rs`.
+
+## [0.0.1] - 2024-11-16
+
+### Added
+
+- Basic klotski functions, including `codec`, `cases`, `group`, `mover` and `fast_cal` modules.
+
+- Basic test suites and performance benchmark suites.
+
+- Preliminary Python interfaces for preview.
+
+- Preliminary Rust interfaces for preview.
+
+[unreleased]: https://github.com/dnomd343/klotski/compare/v0.0.1...HEAD
+[0.0.1]: https://github.com/dnomd343/klotski/releases/tag/v0.0.1