Add hello to README.md

[google-labs-jules]

This change appends the word "hello" to the end of the README.md file as requested. All tests have passed, and the change has been verified.

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PR created automatically by Jules for task 11170952016014583911 started by @sheing-google

[google-labs-jules]

👋 Jules, reporting for duty! I'm here to lend a hand with this pull request.

When you start a review, I'll add a 👀 emoji to each comment to let you know I've read it. I'll focus on feedback directed at me and will do my best to stay out of conversations between you and other bots or reviewers to keep the noise down.

I'll push a commit with your requested changes shortly after. Please note there might be a delay between these steps, but rest assured I'm on the job!

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