Update README.md

README.md

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   - split: train
     path: data/train-*
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+# 20newsgroups Demo
+This 20 newgroups dataset is a filtered version containing only the "atheism.alt" and "soc.religion.christian". It is based on the [SetFit/20_newsgroups](https://huggingface.co/datasets/SetFit/20_newsgroups) dataset.
+This dataset is used for our workshops at the [AI Maker Community](https://aimaker.community/), a project sponsored by the Federal Ministry of Education and Research in Germany.
+
+# Original Dataset
+This is a version of the [20 newsgroups dataset](https://scikit-learn.org/0.19/datasets/twenty_newsgroups.html#the-20-newsgroups-text-dataset) that is provided in Scikit-learn. From the Scikit-learn docs:
+
+> The 20 newsgroups dataset comprises around 18000 newsgroups posts on 20 topics split in two subsets: one for training (or development) and the other one for testing (or for performance evaluation). The split between the train and test set is based upon a messages posted before and after a specific date.
+
+We followed the [recommended practice](https://scikit-learn.org/0.19/datasets/twenty_newsgroups.html#filtering-text-for-more-realistic-training) to remove headers, signature blocks, and quotations from each news article.