Establish 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]
+
+### Changed
+- Made Craco an api dependency such that its API can be used. Removed Math dependency as it is now unnecessary.
+
+## [1.0.0] - 2021-03-05
+
+### Added
+- Initial release
+
+
+[Unreleased]: /~https://github.com/cryptimeleon/predenc/compare/v1.0.0...HEAD
+[1.0.0]: /~https://github.com/cryptimeleon/predenc/releases/tag/v1.0.0