Add Clarvia AEO score badge to README

[digitamaz]

Hi! I am the maintainer of Clarvia — an AEO (Agent Experience Optimization) scoring platform for MCP servers.

We automatically scan and score MCP servers for quality, discoverability, and agent-readiness. Your server browser-tools-mcp has been analyzed.

Add the badge

[![Clarvia AEO Score](https://clarvia.art/api/badge/browser-tools-mcp)](https://clarvia.art/tools/browser-tools-mcp)

The badge links to your full score breakdown with improvement recommendations.

Feel free to close if not relevant!