More documentation for the Vapor 3 changes

[nonfungibletunji]

Can we get some more documentation for the Vapor 3 changes

[noahemmet]

Just FYI, I opened a #graphql channel over on the Vapor Discord server, and I have a branch that at least compiles against the latest version of Vapor (with Futures), although I'm unsure how to set it up.

[noahemmet]

@stunjiturner #2 might be of interest to you.