docs: add changelog

Author: d-Rickyy-b

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]
+### Added
+### Changed
+### Fixed
+### Docs
+
+## [1.1.0] - 2022-03-28
+
+### Added
+- Support for prometheus database 
+
+## [1.0.0] - 2022-02-14
+Initial release! First stable version of GoGeizhalsBot is published as v1.0.0 
+
+[unreleased]: https://github.com/d-Rickyy-b/GoGeizhalsBot/compare/v1.1.0...HEAD
+[1.1.0]: https://github.com/d-Rickyy-b/GoGeizhalsBot/compare/v1.0.0...v1.1.0
+[1.0.0]: https://github.com/d-Rickyy-b/GoGeizhalsBot/tree/v1.0.0