Add NFAA tag

Hi, please add the "Not-For-All-Audiences" tag since this content might not be suitable for all audiences. Here's our content policy for reference: https://huggingface.co/content-guidelines
Thank you!

README.md

@@ -1,3 +1,5 @@
 ---
 license: wtfpl
----
+tags:
+- not-for-all-audiences
+---