Update pipeline tag to make the model easily discoverable. (#11)

- Update README.md (9872a267e449fd5e9aa2381a843574b89acf46f3)


Co-authored-by: Tiezhen WANG <xianbao@users.noreply.huggingface.co>

README.md

@@ -1,6 +1,7 @@
 ---
 license: cc-by-nc-4.0
 library_name: chat_tts
+pipeline_tag: text-to-audio
 ---