Add O-QT MCP architecture figure

Author: Ivo Djidrovski

README.md

@@ -1,4 +1,9 @@
 [![CI](https://github.com/ToxMCP/oqt-mcp/actions/workflows/ci.yml/badge.svg)](https://github.com/ToxMCP/oqt-mcp/actions/workflows/ci.yml)
+
+## Architecture
+
+![O-QT MCP architecture](./assets/oqt-mcp-architecture.jpg)
+
 [![DOI](https://img.shields.io/badge/DOI-10.64898%2F2026.02.06.703989-blue)](https://doi.org/10.64898/2026.02.06.703989)
 [![License](https://img.shields.io/badge/License-Apache--2.0-blue.svg)](./LICENSE)
 [![Release](https://img.shields.io/github/v/release/ToxMCP/oqt-mcp?sort=semver)](https://github.com/ToxMCP/oqt-mcp/releases)