Create CHANGELOG.md

Author: tucker-gordon-bah

CHANGELOG.md

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+# Changelog
+
+This file includes all notable changes made to this project (since `v2.4.0`. Before that unfortunately there was not a record maintained)
+
+The format of this file is from [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).
+
+## [2.4.0]
+
+### Added
+
+- This changelog file (#107)
+
+### Changed
+
+- Upgrade to React 19 (#107)