CHANGELOG.md is added

Author: Ali Tayebi

CHANGELOG.md

@@ -0,0 +1,11 @@
+# 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
+- Version is updated to `2.0.0`
+- `netcoreapp1.1` is dropped from `TargetFrameworks`
+- `CHANGLELOG.md` is added