Add the CHANGELOG

Signed-off-by: Sameer Rahmani <lxsameer@gnu.org>

CHANGELOG

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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]
+### Added
+	- `System` implementation (`core/fg42/system.el`)
+	- New `extensions` implementation (`core/fg42/extensions.el`)
+	- New approach to launching fg42
+### Changed
+	- Changed the main package path to `/core`
+	- Changed the extensions path to `/extensions`
+	- We don't load `fg42-config.el` anymore
+	- We don't load anything from `/lib` anymore