Add pipeline tag and link to paper

README.md

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 license: mit
+library_name: transformers
+pipeline_tag: image-text-to-text
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 <p align="center" width="100%">
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     <sup>2</sup>Microsoft Research, Redmond
 </div>
 
+This repository contains the models presented in [Otter: A Multi-Modal Model with In-Context Instruction Tuning](https://huggingface.co/papers/2305.03726).
 
 You can refer the code to start evaluation and demo on your local machine.
 https://github.com/Luodian/Otter/blob/8b386816ec67b15833cde3dcd1d7ca6a752d2451/pipeline/demos/demo_models.py#L35