Improve model card: Add pipeline tag, library name, link to code, and correct license

This PR improves the model card by:

- Adding the `pipeline_tag` to enable discovery via the text-to-video pipeline.
- Adding the `library_name` to facilitate one-click inference.
- Adding a link to the official code repository.
- Correcting the license to `mit` based on the Github repository.

README.md

@@ -1,5 +1,7 @@
 ---
-license: openrail
+license: mit
+library_name: diffusers
+pipeline_tag: text-to-video
 ---
 
 This repository contains a pruned and isolated pipeline for Stage 2 of [StreamingT2V](https://streamingt2v.github.io/), dubbed "VidXTend."
@@ -15,6 +17,7 @@ This model's primary purpose is extending 16-frame 256px x 256x animations by 8
 }
 ```
 
+Code: https://github.com/Picsart-AI-Research/StreamingT2V
 
 # Usage