Warning for 18+ Content and Imagery

[koronkowy]

It might be a good idea to let folks know in the readme that we are not responsible for the content of the stickers and/or that we don't necessarily agree with the content. There are some stickers that probably should not be public, but there are some with colorful language or imagery that might appear here.

[securingdev]

Really good point; Should we create a separate section for 18+ stickers and a "open at your own risk" warning?

Is there any sort of guidance that GItHub provides, or examples of other projects that have implemented such a standard?