Link demo to paper and models

With this change, the Space will also be linked from https://arxiv.org/abs/2305.16355 (as we automatically parse arxiv links) and https://huggingface.co/openllmplayground/vicuna_7b_v0

README.md

@@ -8,6 +8,9 @@ sdk_version: 3.30.0
 app_file: app_case.py
 pinned: false
 license: other
+models: ["openllmplayground/vicuna_7b_v0"]
 ---
 
+Paper: https://arxiv.org/abs/2305.16355
+
 Check out the configuration reference at https://huggingface.co/docs/hub/spaces-config-reference