Adds Proxy and Broadcasting relay lists.

[vitorpamplona]

Adds lists for specific proxy/broadcasting relays and guides clients on how to work with them.

Read here

[staab]

I like that the relay selections are encrypted. I would also like to see private relay selections as well (not intended to be used for outbox relay selection), but that can wait for another PR.

[vitorpamplona]

I would also like to see private relay selections as well (not intended to be used for outbox relay selection), but that can wait for another PR.

I added one in the #1124 Generic Draft NIPs. It's a relay for all the private settings and things no one else needs to know, like private drafts.

[staab]

That's yet another (useful) category. I was thinking of something more along these lines.

[erskingardner]

Love this idea. 👍

[mikedilger]

I'm in favor of this PR, for sharing this config between clients that use this model.

Gossip client won't support it, but people pretty much know that already; I don't think they will be surprised.