Add pipeline tag, license and library name

This PR adds the pipeline tag and library name to the model card, which will enable it to be found at https://huggingface.co/models?pipeline_tag=audio-text-to-text.
It also adds the appropriate Apache 2.0 license.

README.md

@@ -1,3 +1,9 @@
+---
+license: apache-2.0
+library_name: transformers
+pipeline_tag: audio-text-to-text
+---
+
 # 🦙🎧 LLaMA-Omni 2: LLM-based Real-time Spoken Chatbot with Autoregressive Streaming Speech Synthesis
 
 > **Authors: [Qingkai Fang](https://fangqingkai.github.io/), [Yan Zhou](https://zhouyan19.github.io/zhouyan/), [Shoutao Guo](https://scholar.google.com/citations?hl=en&user=XwHtPyAAAAAJ), [Shaolei Zhang](https://zhangshaolei1998.github.io/), [Yang Feng*](https://people.ucas.edu.cn/~yangfeng?language=en)**
@@ -152,4 +158,4 @@ If our work is useful for you, please cite as:
   year={2025},
   url={https://openreview.net/forum?id=PYmrUQmMEw}
 }
-```
+```