docs: add CHANGELOG.md

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]
+
+## [0.2.0] - 2026-04-04
+
+### Added
+
+- `arborist about` subcommand displaying project metadata (version, description, author, license, repository, website).
+
+### Removed
+
+- `homepage` field from Cargo.toml — repository URL is sufficient for crates.io.
+
+## [0.1.1] - 2026-04-03
+
+### Fixed
+
+- Binary name set to `arborist` instead of `arborist-cli`.
+
+## [0.1.0] - 2026-04-03
+
+### Added
+
+- Core CLI with cognitive complexity, cyclomatic complexity, and SLOC analysis powered by `arborist-metrics`.
+- Multiple output formats: table, JSON, and CSV.
+- `--threshold` and `--exceeds-only` flags for filtering by cognitive complexity.
+- `--sort` flag to sort results by cognitive, cyclomatic, SLOC, or name.
+- `--top N` flag to limit output to the top N results.
+- `--languages` filter for directory traversal by language.
+- `--gitignore` flag to respect `.gitignore` patterns during traversal.
+- `--no-methods` flag to exclude method-level analysis.
+- `--language` flag for specifying language when reading from stdin.
+- `arborist update` subcommand for self-updating via GitHub releases.
+- cargo-dist release infrastructure for cross-platform binary distribution.
+- CI workflow with clippy lints and test suite.
+- Published to crates.io as `arborist-cli`.
+
+[Unreleased]: https://github.com/StrangeDaysTech/arborist-cli/compare/v0.2.0...HEAD
+[0.2.0]: https://github.com/StrangeDaysTech/arborist-cli/compare/v0.1.1...v0.2.0
+[0.1.1]: https://github.com/StrangeDaysTech/arborist-cli/compare/v0.1.0...v0.1.1
+[0.1.0]: https://github.com/StrangeDaysTech/arborist-cli/releases/tag/v0.1.0