docs: add Twitter clone

[AlandSleman]

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• I have followed every step in the contributing guide (updated 2022-10-06).
• The PR title follows the convention we established conventional-commit
• I performed a functional test on my final commit

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Changelog

Added Twitter clone to the list of open source apps

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Name	Status	Preview	Comments	Updated
create-t3-app	✅ Ready (Inspect)	Visit Preview	💬 Add your feedback	Mar 16, 2023 at 4:01PM (UTC)

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