Add task category, paper link and Github link

This PR adds the `audio-text-to-text` task category to the dataset card, and adds a link to the paper.

README.md

@@ -1,3 +1,9 @@
----
-license: gpl-3.0
----
+---
+license: gpl-3.0
+task_categories:
+- audio-text-to-text
+---
+
+This repository contains the dataset used in the paper [Stream-Omni: Simultaneous Multimodal Interactions with Large Language-Vision-Speech Model](https://arxiv.org/abs/2506.13642).
+
+Code: https://github.com/ictnlp/Stream-Omni