Update README.md

README.md

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-**💪 Feel free to join the organization if you want to add a dataset with a similar purpose :) Please [tell me](https://tillwenke.github.io/about/) about your dataset before asking to join the org.**
+This organization and its dataset are not actively maintained anymore. Still you are invited to add similar datasets to it.
+
+**Feel free to join the organization if you want to add a dataset with a similar purpose :) Please [tell me](https://tillwenke.github.io/about/) about your dataset before asking to join the org.**
 
 To test your **RAG** and other **semantic information retrieval solutions** it would be powerful to have access to a dataset that consists of a text corpus,
 correct responses to queries (e.g. question-answer) to test the solution end-to-end and maybe even a set of relevant passages