Create README.md -- Add NFAA tag

According to our content policy (https://huggingface.co/content-guidelines), I am adding a "Not For All Audiences" tag since it contains problematic content. We would also strongly suggest updating the name of the dataset to make the content clear and prevent unwanted access.

Thank you for your cooperation.

README.md

@@ -0,0 +1,4 @@
+---
+tags:
+- not-for-all-audiences
+---