Add model card

This PR adds a model card for [Table-R1: Inference-Time Scaling for Table Reasoning](https://huggingface.co/papers/2505.23621).

It ensures the model can be found at https://huggingface.co/models?pipeline_tag=table-question-answering.

README.md

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+---
+pipeline_tag: table-question-answering
+library_name: transformers
+---
+
+This repository contains the model of the paper [Table-R1: Inference-Time Scaling for Table Reasoning](https://huggingface.co/papers/2505.23621).
+
+Project page: https://huggingface.co/Table-R1
+Code: https://github.com/Table-R1/Table-R1.