adds library tag

this enables a toggle that automatically generates an inference snippet with diffusers that users can copy-paste and run :)

README.md

@@ -16,6 +16,7 @@ tags:
 datasets:
 - CaptionEmporium/pexels-568k-internvl2
 license: mit
+library_name: diffusers
 ---
 
 # Qwen 360 Diffusion