Update library tag for better download tracking and code snippets!

Hi, I'm Steven from HF! Congrats on the release, I opened a small PR to help get clearer and better snippets + library_name

README.md

@@ -3,6 +3,8 @@ license: mit
 language:
 - en
 pipeline_tag: text-to-speech
+library_name: vui
+
 ---
 # vui