Add model card

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

It adds the relevant metadata, including the license, library name, and pipeline tag.

README.md

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+---
+license: cc-by-4.0
+library_name: transformers
+pipeline_tag: table-question-answering
+---
+
+The Table-R1 model, as presented in the paper [Table-R1: Inference-Time Scaling for Table Reasoning](https://huggingface.co/papers/2505.23621), explores inference-time scaling on table reasoning tasks. It uses distillation from frontier model reasoning traces and reinforcement learning with verifiable rewards (RLVR). The model matches or exceeds the performance of GPT-4.1 and DeepSeek-R1, while using only a 7B-parameter LLM.
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+- **Paper:** [Table-R1: Inference-Time Scaling for Table Reasoning](https://huggingface.co/papers/2505.23621)
+- **Code:** [Table-R1 Github Repository](https://github.com/Table-R1/Table-R1)
+- **Project Page:** [Table-R1 Hugging Face Organization](https://huggingface.co/Table-R1)