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It seems like one of the most common sources of off-topic questions.
I saw this post which looked positive. What are the costs / needs to get one started?
You need to assemble a group of people willing to kickstart the site, then propose it on https://area51.stackexchange.com/. The full process is described here but be aware that you need to get through it quite quickly which won't be possible without having the community all ready to go.