Add model card

This PR adds a model card for the paper [ZeroSearch: Incentivize the Search Capability of LLMs without Searching](https://huggingface.co/papers/2505.04588).

It also adds the license, library name, pipeline tag, project page, and code repository.

Please review and merge this PR if everything looks good.

README.md

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+---
+license: apache-2.0
+library_name: transformers
+pipeline_tag: text-generation
+---
+
+This repository contains the model of the paper [ZeroSearch: Incentivize the Search Capability of LLMs without Searching](https://huggingface.co/papers/2505.04588).
+
+Project page: https://alibaba-nlp.github.io/ZeroSearch
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+Code: https://github.com/PeterGriffinJin/Search-R1.