update README; add Docker badge to indicate Docker requirement for the multimodal code agent

Author: dcloud347

README.md

@@ -3,6 +3,7 @@
 ![Python](https://img.shields.io/badge/python-3.10+-blue.svg)
 ![License](https://img.shields.io/badge/license-MIT-green.svg)
 ![LLM](https://img.shields.io/badge/LLM-OpenAI%20%7C%20Anthropic-orange.svg)
+![Docker](https://img.shields.io/badge/docker-required-2496ED.svg?logo=docker&logoColor=white)
 
 **A multimodal code agent that works together with web use agent.**
 Give an frontier agent a reliable tool to visually verify its code changes in a live browser environment.