Docs: add a Wikipedia page about Sniffnet

I just realised Sniffnet still doesn't have a page on Wikipedia 😱

I'll leave this issue here hoping that someone has the time and will to write it down!

You can give a look at the [Sniffnet blog](https://sniffnet.net/news/) and [my thesis](https://github.com/GyulyVGC/sniffnet/blob/main/resources/thesis.pdf) to find more info about the project.

Start by reviewing the Sniffnet blog and resources/thesis.pdf to gather reliable project information. Use those sources to determine the scope and factual content of a Wikipedia page; the work is done when a suitable page about Sniffnet has been written and published according to Wikipedia’s requirements.

Written by the indexing model from the issue text.