Make download stats work

This PR will enable download stats to work. See here for more info: https://huggingface.co/docs/hub/models-download-stats#can-i-add-my-query-files-for-my-library.

README.md

@@ -1,5 +1,6 @@
 ---
 license: apache-2.0
+library_name: ella
 tags:
 - text2image
 - stable-diffusion