Add dataset card with metadata and links (#1)

- Add dataset card with metadata and links (fe990bc917c8de43a9061bc0b5c92d58088acd08)


Co-authored-by: Niels Rogge <nielsr@users.noreply.huggingface.co>

README.md

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+---
+license: mit
+task_categories:
+- text-generation
+tags:
+- synthetic-data
+- pre-training
+- language-modeling
+---
+
+# Synthetic Pre-pretraining Datasets
+
+This repository contains the pre-processed datasets released with the paper [Synthetic Pre-pretraining Survives Scale, but Not as a Grammatical Prior](https://huggingface.co/papers/2609.39827).
+
+The datasets cover both pre-pretraining (PPT) tasks and pre-training (PT) mixtures used in the paper. PPT tasks include k-Shuffle Dyck, Set, MP-Struct Core, and NCA; PT mixtures include C4, SmolLM3, Olmo3, Marin, and FineWeb-Edu configurations. The pre-processed data are tokenized and organized by configuration.
+
+- Paper: [https://huggingface.co/papers/2609.39827](https://huggingface.co/papers/2609.39827)
+- Code: [https://github.com/gucci-j/verify-ppt-at-scale](https://github.com/gucci-j/verify-ppt-at-scale)
+- Project page: [https://huggingface.co/verify-ppt](https://huggingface.co/verify-ppt)
+
+For details on dataset composition, preprocessing, training, and evaluation, please refer to the [GitHub repository](https://github.com/gucci-j/verify-ppt-at-scale).