docs(changelog): add template

CHANGELOG

-

CHANGELOG.md

+# 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
+
+- ...
+
+### Changed
+
+- ...
+
+### Deprecated
+
+- ...
+
+### Removed
+
+- ...
+
+### Fixed
+
+- ...
+
+### Security
+
+- ...
+
+## [1.0-alpha1] - 2023-02-22
+
+Initial release.
+