Add library name, correct pipeline tag

This PR fixes the `pipeline_tag` so the model can be found at https://huggingface.co./models?pipeline_tag=video-classification, and adds
`library_name` to the model card.

README.md

@@ -1,9 +1,11 @@
 ---
-license: agpl-3.0
 language:
 - en
-pipeline_tag: action-detection
+license: agpl-3.0
+pipeline_tag: video-classification
+library_name: pytorch
 ---
+
 # Official PyTorch Implementation of SiA
 
 Official PyTorch implementation of SiA, our model from **[Scaling Open-Vocabulary Action Detection](https://arxiv.org/abs/2504.03096)**. If you use this code for your research, please cite our paper.