Add dataset card with metadata and links

README.md

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+---
+license: mit
+task_categories:
+- text-generation
+language:
+- en
+tags:
+- synthetic-data
+- pre-training
+- language-modeling
+---
+
+# Synthetic Pre-pretraining Datasets
+
+This repository contains the pre-processed datasets used in the paper [Synthetic Pre-pretraining Survives Scale, but Not as a Grammatical Prior](https://huggingface.co/papers/2609.39827).
+
+The datasets cover synthetic pre-pretraining (PPT) tasks (e.g., k-Shuffle Dyck, Set, MP-Struct Core, NCA) and corresponding control/pre-training data mixtures (e.g., C4, SmolLM3, Olmo3, Marin, FineWeb-Edu). They are tokenized and intended for language model pre-pretraining and pre-training experiments across multiple model scales.
+
+- Project page: https://huggingface.co/verify-ppt
+- Code: https://github.com/gucci-j/verify-ppt-at-scale
+
+For the full list of available dataset repositories, preprocessing scripts, and training/evaluation details, please refer to the GitHub repository and the project page.