Add model card

This PR adds a model card, linking the model to the paper [Next Block Prediction: Video Generation via Semi-Auto-Regressive Modeling](https://huggingface.co/papers/2502.07737) and the code implementation at https://github.com/RenShuhuai-Andy/NBP. It also ensures the model can be found at https://huggingface.co/models?pipeline_tag=video-to-video

README.md

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+pipeline_tag: video-to-video
+---
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+This repository contains the model described in [Next Block Prediction: Video Generation via Semi-Auto-Regressive Modeling](https://huggingface.co/papers/2502.07737).
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+Code: https://github.com/RenShuhuai-Andy/NBP.