Add CHANGELOG and enforcing

Author: korken89

.github/workflows/changelog.yml

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+name: Changelog
+
+on:
+  pull_request:
+    types: [opened, reopened, labeled, unlabeled, synchronize]
+
+jobs:
+  changelog:
+    name: Changelog
+    runs-on: ubuntu-latest
+
+    steps:
+    - uses: actions/checkout@v4
+
+    - uses: dangoslen/changelog-enforcer@v3
+      with:
+        changeLogPath: CHANGELOG.md
+        skipLabels: "skip-changelog"
+        missingUpdateErrorMessage: "Please add a changelog entry in the CHANGELOG.md file"
+      env:
+        GITHUB_TOKEN: ${{ secrets.GITHUB_TOKEN }}

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/1.0.0/),
+and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0.html).
+
+## [Unreleased]
+
+### Added
+- ARM NEON SIMD implementation for aarch64 targets
+- x86-64 SSE2 SIMD implementation for x86_64 targets
+
+## [0.1.1] - 2025-01-27
+
+Initial public release.
+
+[Unreleased]: https://github.com/korken89/gimli-crypto/compare/v0.1.1...HEAD
+[0.1.1]: https://github.com/korken89/gimli-crypto/releases/tag/v0.1.1