Add model card

This PR adds a model card.

README.md

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+---
+pipeline_tag: any-to-any
+tags:
+- Any2Any
+---
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+**Lumina-mGPT** is a family of multimodal autoregressive models capable of various vision and language tasks, particularly excelling in generating flexible photorealistic images from text descriptions.
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+[![Lumina-mGPT](https://img.shields.io/badge/Paper-Lumina--mGPT-2b9348.svg?logo=arXiv)](https://arxiv.org/abs/2408.02657)
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+![image/png](https://cdn-uploads.huggingface.co/production/uploads/6358a167f56b03ec9147074d/hgaCZdtmdlCDcZ8tb4Rme.png)
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+# Usage
+We provide the implementation of Lumina-mGPT, as well as sampling code, in our [github repository](https://github.com/Alpha-VLLM/Lumina-mGPT).