docs: add changelog

Author: danceratopz

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).
+
+## [v0.1.0] - 2025-07-09
+
+Initial release of the Python Hive Simulator API with:
+
+- Network configuration support.
+- Client management functionality.
+- Test suite management functionality.