Add notice about project completion

README.md

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 # YouTube Community Contributions Archiving Worker
 
 <a href="https://discord.gg/7QxcBvw"><img alt="Discord" src="https://img.shields.io/discord/755014354734153818?style=plastic"></a>
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+## This project is now complete, and we are working on sorting and finalizing the data. Thank you to everyone who contributed!
   
 Worker for the `Save Community Captions` project: Archiving unpublished YouTube community-contributions.