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/1.0.0/),
+and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0.html).
+
+## Unreleased
+
+<!-- Add your changelog entry to the relevant subsection -->
+
+<!-- ### Added | Changed | Deprecated | Removed | Fixed | Security -->
+
+<!-- No new entries below this line! -->
+
+## [1.0.0] - 2022-10-12
+
+This is the first release.