fixup! Move content from README.md to README.rst

CHANGELOG.md

-# 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]
-
-## [1.0.0] - 2019-10-21
-### Added
-- First release of general-cores.
-
-[Unreleased]: https://www.ohwr.org/project/general-cores/compare/v1.0.0...proposed_master
-[1.0.0]: https://www.ohwr.org/project/general-cores/tags/v1.0.0