Create node.js backend

[brycemck]

Will need a node.js backend that starts the web server, has a websocket that other things could connect to if necessary, and read/write to preference/store files.

[dannysheridan]

@brycemck have you considered going schema-first and auto-generating the networking logic & types on the backend? our open source project supports Express if that's the server framework you've picked: www.buildwithfern.com