Add model card

This PR adds a model card, linking it to the paper [OpenVision: A Fully-Open, Cost-Effective Family of Advanced Vision Encoders for Multimodal Learning](https://huggingface.co/papers/2505.04601). It also adds a relevant pipeline tag and links to the project page and the Github repository.

README.md

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+---
+license: apache-2.0
+library_name: open_clip
+pipeline_tag: image-feature-extraction
+---
+
+This repository contains the OpenVision ViT model described in the paper [OpenVision: A Fully-Open, Cost-Effective Family of Advanced Vision Encoders for Multimodal Learning](https://huggingface.co/papers/2505.04601).
+
+Project page: https://ucsc-vlaa.github.io/OpenVision
+
+Code: https://github.com/UCSC-VLAA/OpenVision