docs: make release CHANGELOG (#74)

Author: lukeroantreeONS

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/1.1.0/),
+and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0.html).
+
+## [v0.1.0] - 2025-11-04
+
+### Added
+
+- Vectoriser Class - Abstract base class, and GCP, HuggingFace, Ollama Vectorisers
+- Vector Store Class
+- REST API - FastAPI served with Uvicorn
+- Documentation and Demo - README and Jupyter Notebook minimal demo with fake dataset.
+