Add model card for Table-R1

This PR adds a model card for the Table-R1 model repository. It includes:
- Basic description of the model based on the abstract
- Links to the paper, Github repository and project page
- Adds library_name: transformers (based on the model files such as config.json, tokenizer_config.json, ...)
- Sets the correct pipeline tag (table-question-answering)

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.
+
+- **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)