add changelog

CHANGELOG.md

@@ -0,0 +1,21 @@
+# 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]
+
+## [0.1.0] - 2024-04-17
+
+### Added
+
+- This CHANGELOG file to document all significant changes
+- LICENSE
+- CONTRIBUTING guidelines
+- MAINTAINERS file
+- minimal implementation of the exporter
+
+[unreleased]: https://gitlab.com/adoralaura/ntppool-exporter/compare/v0.1.0...HEAD
+[0.1.0]: https://gitlab.com/adoralaura/ntppool-exporter/releases/tag/v0.1.0