Add comment to connect with arXiv paper

Following the comment from /static-proxy?url=https%3A%2F%2Fdiscuss.huggingface.co%2Ft%2Fhow-to-link-the-spaces-with-arxiv%2F27094%2F2%3Fu%3Ddeepkyu%2C I add the HF model card link as a comment.

app.py

@@ -1,3 +1,4 @@
+# https://huggingface.co/deepkyu/ml-talking-face
 import os
 import subprocess