[#32] Add a Changelog file (#39)

- Added `CHANGELOG.md` based on [Keep a
Changelog](https://keepachangelog.com/en/1.0.0/) template
- Added Dev-branch changelogs

Author: Allstreamer

CHANGELOG.md

@@ -0,0 +1,26 @@
+<!--Markdownlint Rules-->
+<!-- markdownlint-disable no-duplicate-header-->
+
+# 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
+
+- Changed CLI to use CLAP [#6](https://github.com/John15321/rust-pip/pull/6)
+
+### Docs
+
+- Added changelog [#39](https://github.com/John15321/rust-pip/pull/39)
+
+## [0.0.1] 22 July 2022
+
+### Added
+
+- Added Basic CLI functionality using StructOpt
+- Added Base Project