Add link to paper and project page

This PR ensures the dataset is linked to (and can be found at) https://huggingface.co/papers/2503.07536.

README.md

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+---
+task_categories:
+- table-question-answering
+---
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+This repository contains the data presented in [LMM-R1: Empowering 3B LMMs with Strong Reasoning Abilities Through Two-Stage Rule-Based RL](https://huggingface.co/papers/2503.07536).
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+Project page: https://forjadeforest.github.io/LMM-R1-ProjectPage