DEVPROD-31010: Add hello world to README

[mongodb-sage-bot]

Add hello world text to the README of the commit-queue-sandbox repo.

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Important

MongoDB Contribution Guidelines

This pull request was generated by sage-bot on behalf of kimberly.tao@mongodb.com (ticket assignee). The assignee must self-review the changes before requesting review from another engineer.
The assignee is not allowed to merge their own PR without approval from another engineer.

• kimberly.tao@mongodb.com has read and agrees to the MongoDB AI Policy
• kimberly.tao@mongodb.com has self-reviewed this PR before requesting review from another engineer

[mongodb-sage-bot]

Sage Bot can help with this pull request. Just @sage-bot in comments and I'll start working on changes in this branch.
_{Learn more about Sage Bot}

[malikchaya2]

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