Add model card

This PR adds a model card, makes sure the models can be viewed from https://huggingface.co/papers/2402.17766.

README.md

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+--- 
+tags:
+- 3d-understanding
+- 3d-question-answering
+- 3d-classification
+--- 
+
+This repository contains the ReCon++ models presented in [ShapeLLM: Universal 3D Object Understanding for Embodied Interaction](https://huggingface.co/papers/2402.17766).
+
+See the Github repository for more info: https://github.com/qizekun/ShapeLLM/tree/main.