atelier-core-0.1.0.0: CHANGELOG.md

# Changelog

All notable changes to `atelier-core` will be documented in this file.

The format is based on [Keep a Changelog](https://keepachangelog.com/en/1.1.0/),
and this project adheres to the [PVP](https://pvp.haskell.org/).

## [Unreleased]

### Added

- Initial release: foundational Effectful-based effects and utilities,
  extracted from the atelier toolkit.