Added CHANGELOG

Author: GCHQDeveloper1138

CHANGELOG.md

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+# Changelog
+
+## Versioning
+
+CyberChef Server uses the [semver](https://semver.org/) system to manage versioning: `<MAJOR>.<MINOR>.<PATCH>`.
+
+- MAJOR version changes represent a significant change to the fundamental architecture of CyberChef and may (but don't always) make breaking changes that are not backwards compatible.
+- MINOR version changes usually mean the addition of new operations or reasonably significant new features.
+- PATCH versions are used for bug fixes and any other small tweaks that modify or improve existing capabilities.
+
+All major and minor version changes will be documented in this file. Details of patch-level version changes can be found in [commit messages](https://github.com/gchq/CyberChef-server/commits/master).
+
+
+## Details
+
+### [1.0.0-beta] - 2024-10-04
+- CyberChef functionality brought in line with the mainline release
+- Upgraded to use ESM modules throughout
+- Works with recent versions of NodeJS
+- Re-orged the codebase slightly and slimmed down/updated some dependencies
+- Upgraded the base Docker image to Node 18