Add tag "not-for-all-audiences" (NSFW)

Hi! I suggest we add this tag for transparency, let me know what you think. Thanks!

README.md

@@ -9,6 +9,8 @@ app_file: app.py
 pinned: false
 license: agpl-3.0
 duplicated_from: ezioruan/roop
+tags:
+  - not-for-all-audiences
 ---
 
 Check out the configuration reference at https://huggingface.co/docs/hub/spaces-config-reference