Add MCPpedia security badge to README

[BbekShr]

Hi 👋

The Browserbase MCP Server scores well on MCPpedia — one of the top browser automation MCP servers we track.

MCPpedia is a free directory that security-scores 17,000+ MCP servers. We scan for CVEs, detect tool poisoning, and check injection vectors daily.

Would you consider adding a badge to your README? It helps users see at a glance that your server has been vetted:

Markdown:

[![MCPpedia Score](https://mcppedia.org/api/badge/browserbase)](https://mcppedia.org/s/browserbase)

The badge updates automatically as your score changes. There's also a security-specific variant (?type=security).

Your full report: https://mcppedia.org/s/browserbase

Thanks for building a great MCP server! 🙏