Add pipeline tag

This PR ensures the model can be found at https://huggingface.co/models?pipeline_tag=text-to-video.

README.md

@@ -1,6 +1,8 @@
 ---
 license: apache-2.0
+pipeline_tag: text-to-video
 ---
+
 <div align="center">
 
 # ⚡ Self Gradient Forcing
@@ -191,4 +193,4 @@ This project is released under the Apache-2.0 license.
       primaryClass={cs.CV},
       url={https://arxiv.org/abs/2607.20368}, 
 }
-```
+```