Update README with user attachments link

Added a link to user attachments in the README.

Author: NathanTarbert

README.md

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 # aimock [![Unit Tests](https://github.com/CopilotKit/aimock/actions/workflows/test-unit.yml/badge.svg)](https://github.com/CopilotKit/aimock/actions/workflows/test-unit.yml) [![Drift Tests](https://github.com/CopilotKit/aimock/actions/workflows/test-drift.yml/badge.svg)](https://github.com/CopilotKit/aimock/actions/workflows/test-drift.yml) [![npm version](https://img.shields.io/npm/v/@copilotkit/aimock)](https://www.npmjs.com/package/@copilotkit/aimock)
 
+https://github.com/user-attachments/assets/646bf106-0320-41f2-a9b1-5090454830f3
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 Mock infrastructure for AI application testing — LLM APIs, MCP tools, A2A agents, vector databases, search, rerank, and moderation. One package, one port, zero dependencies.
 
 ## Quick Start