docs: add a CHANGELOG file

Author: williamdes

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] - yyyy-mm-dd
+
+- Added `ReturnTypeWillChange` for PHP 8.1 on SignRequest and RegistrationRequest
+- Wrote tests for most of the code of this library
+- Run tests on GitHub actions
+- Changed the namespace from `Samyoul` to `CodeLts`
+- Cleaned up the code
+- Added a `.gitattributes` file
+- Improved phpdoc blocks
+- Wrote betters comments
+- Added a CHANGELOG file
+- Improved the README file
+
+## [1.1.4] - 2018-10-26
+
+- Fix issue when there is more than one U2F key registered
+
+## [1.1.3] - 2016-12-14
+
+- Fix public property access bug in `U2FServer` class
+- Made `SignRequest` class json `JsonSerializable`
+
+## [1.1.2] - 2016-12-13
+
+- Replaced `toString()` with `jsonSerialize()` on `RegistrationRequest` class
+
+## [1.1.1] - 2016-12-13
+
+- Added `toString()` on `RegistrationRequest` class
+
+## [1.1.0] - 2016-12-13
+
+- Re-Namespaced the classes
+
+## [1.0.0] - 2016-12-12
+
+- First version