Update README.md

README.md

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 # Lexoffice Invoice Upload
 
+> [!WARNING]
+> Since you now can send/redirect mails directly to Lexoffice (see [docs](https://support.lexoffice.de/de-form/articles/9366911-eingangsbelege-uber-e-mail-hochladen)), this project is no longer needed and therefore _**deprecated**_.  
+> If you (like me) use Paperless-ngx as your document management system, you can also instead use the [paperless-to-lexoffice](https://github.com/stefanlachner/paperless-to-lexoffice) project.
+
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