Final update to readme (#57)

README.md

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+> Note: As of May 2024, this repository has been archived and the development of the metadata extractor schema continues under the [datatractor/schema](https://github.com/datatractor/schema) project.
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 <div align="center" style="padding-bottom: 1em;">
 <img width="100px" align="center" src="https://avatars.githubusercontent.com/u/74017645?s=200&v=4">
 </div>