Added changelog

Author: sea5kg

CHANGELOG.md

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+# Changelog
+
+All notable changes to wsjcpp-core project will be documented in this file.
+
+The format is based on [Keep a Changelog](http://keepachangelog.com/)
+and this project adheres to [Semantic Versioning](http://semver.org/).
+
+## [v0.2.2] - 2021-??-?? (2021 ?? ??)
+
+### Added
+
+- Added test for normalize path
+- Added test case for replace all
+- Added build_simple.bat for windows
+
+### Changed
+
+- Up c++ to version 17 (need for std::filesystem)
+- Redesign getListOfDisrs to using crossplatform std::filesystem
+
+### Fixed
+
+- Fixed setFilePermissions