Create dataset card

This PR creates a dataset card for the dataset. It links the dataset to the paper at https://huggingface.co/papers/2502.19413 and adds the `question-answering` task category. It also links to the project page.

README.md

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+---
+task_categories:
+- question-answering
+---
+
+This dataset is part of the [Project Alexandria](https://projects.laion.ai/project-alexandria/) initiative and is described in the paper []. It appears to be related to question answering, though additional details are scarce at the moment.
+
+Paper: https://huggingface.co/papers/2502.19413