add changelog; see changelog <3

CHANGELOG.md

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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/1.1.0/),
+and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0.html).
+
+## [Unreleased]
+
+### Added
+
+- test suite for non-IO functions
+- debug/release outputs of Nix flake
+
+### Changed
+
+- use Rotors rather than Quaternions for rotation; easily extended to 4D
+
+### Fixed
+
+- semantic issues
+
+## [0.1.0] - 2025-12-07
+
+### Added
+
+- CHANGELOG.md
+- layer correctly drawn objects in the view function
+
+### Changed
+
+- 8xMSAA rather than 4xMSAA window hint to improve AA
+- todo and changelog in CHANGELOG.md rather than README.md
+- a nubmer fo functions from Game module now in Game.Internal
+- initResources takes an array of objects to draw rather than hardcoded arrays
+- square the far plane of the perspective transform
+- loop function takes delta time
+
+### Fixed
+
+- constrained pitch to disallow gimbal lock and an inverted view