Embed Agent-Friendly Score badge in README

[hsnice16]

Hello team,

I am working on a project that scores public codebases based on agent friendliness. And spec-kit has scored 82.3 out of 100.

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You can add the badge in your README to let the world know about it. You just need to copy and paste this snippet 👇

[![Agent Friendly](https://agentfriendlycode.com/api/badge/github/github/spec-kit.svg)](https://agentfriendlycode.com/repo/124)

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https://www.agentfriendlycode.com/repo/124