docs: Changelog

CHANGELOG.md

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+# Changelog
+
+All notable changes to components of this project since 0.5.14 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
+
+- PowerShell support by [artiga033](https://github.com/iffse/pay-respects/pull/15)
+- MSYS2 fix by [mokurin000](https://github.com/iffse/pay-respects/pull/12)
+- Command not found mode: Run `pay-respects` automatically by shell
+	- Suggest command if a good match is found
+	- If no good match is found, search if package manager has a binary with the same name and prompt to install
+- Multiple suggestions
+
+### Changed
+
+- Major project refactoring
+- Default request-AI API
+- i18n updates
+
+## [0.5.14]
+
+History start.
+
+[unreleased]: https://github.com/iffse/pay-respects/compare/v0.5.14..HEAD
+[0.5.14]: https://github.com/iffse/pay-respects/commits/v0.5.14