Improve model card

This PR improves the model card by adding the `pipeline_tag` and the `license` to the metadata section.

README.md

@@ -1,3 +1,8 @@
+---
+license: cc-by-nc-sa-4.0
+pipeline_tag: image-to-video
+---
+
 This is the official checkpoints of "Disentangle Identity, Cooperate Emotion: Correlation-Aware Emotional Talking Portrait Generation".
 
 Project Page: https://toto222.github.io/DICE-Talk/
@@ -6,8 +11,4 @@ Paper: https://arxiv.org/abs/2504.18087
 
 Code: https://github.com/toto222/DICE-Talk
 
-Welcome to try.
-
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-license: cc-by-nc-sa-4.0
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+Welcome to try.