Add not-for-all-audiances tag to comply with HF guidelines.

This PR adds the 'not-for-all-audiences' tag to the readme to comply with HF rules, read more here:
https://huggingface.co/content-guidelines

README.md

@@ -8,6 +8,7 @@ pipeline_tag: text-to-image
 library_name: diffusers
 tags:
 - art
+- not-for-all-audiences
 ---
 ### Model Card for FLUX.1 [dev] Abliterated