bitmasks-0: CHANGELOG.md

# Changelog for `bitmasks`

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 the
[Haskell Package Versioning Policy](https://pvp.haskell.org/).


## 0 - 2025-09-17

* Bitmask data types with API and tests.