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 aiohttp has scored 91.9 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/aio-libs/aiohttp.svg)](https://agentfriendlycode.com/repo/12657)

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https://www.agentfriendlycode.com/repo/12657

[Dreamsorcerer]

I've blocked about 10 agent/bot accounts in the last month alone, I certainly don't want to add something that looks like we're encouraging them...

[hsnice16]

💯

Dealing with bot accounts has always been tough.

But the axios team added it after finding that it really works.
axios/axios#10803