feat: creat initial changelog file

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
+
+## [0.1.0] - 2020-11-17
+Initial release! First usable version of backmeup is published as v0.1.0 
+
+[unreleased]: https://github.com/d-Rickyy-b/backmeup/compare/v0.1.0...HEAD
+[0.1.0]: https://github.com/d-Rickyy-b/backmeup/tree/v0.1.0