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

@@ -6,6 +6,7 @@ language:
 base_model:
 - openbmb/MiniCPM4-0.5B
 pipeline_tag: text-to-speech
+library_name: VoxCPM
 tags:
 - text-to-speech
 - speech