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).
+
+## [2.0.5]
+### Added
+- Readme file
+---
+### Fixed
+- Fixed channels and groups collision 
+
+## [2.0.4]
+### Fixed
+- Casting in additional data
+- Regulations checkbox
+
+## [2.0.3]
+### Fixed
+- Fixed logging
+
+## [2.0.2]
+### Fixed
+- Performance improvements
+
+## [2.0.1]
+### Added
+- Changes required for tpay-com/tpay-magento2-graphql
+
+## [2.0.0]
+### Added
+- New version introducing (details below)
+- Card payment in PLN and other currencies
+- Tpay OpenApi (PLN) and Tpay OriginApi (PLN and card sales in other currencies) support
+- Generic payment methods which can be displayed in checkout
+- Code refactored to PSR-12 standards
+- Bumped versions of Tpay libraries
+- Sandbox Support
+- Add changelog