Add change log

CHANGELOG.md

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+# Changelog
+
+All notable changes to this project will be documented in this file.
+
+This project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0.html).
+The public API in the sense of Semantic Versioning currently consists of the
+documented, public classes and functions in the `desec` Python module, with the
+exception of those that are marked as not yet stable in the documentation.
+The command line interface is not currently considered stable and may change on
+minor version bumps. If this happens, it will be clearly marked as a breaking
+change in this change log.
+Similarly, the project's dependencies are not part of the public API and may
+change on minor version bumps. This, too, will be noted as a breaking change in
+this file.
+
+## [1.0.0] - 2024-06-30
+
+* First versioned release
+
+[1.0.0]: https://github.com/s-hamann/desec-dns/releases/tag/v1.0.0