ui: Initial Elm UI import

Merged from https://github.com/jhillyerd/inbucket-elm

Uses https://github.com/halfzebra/create-elm-app

ui/src/Ports.elm

@@ -0,0 +1,13 @@
+port module Ports exposing (onSessionChange, storeSession, windowTitle)
+
+import Data.Session exposing (Persistent)
+import Json.Encode exposing (Value)
+
+
+port onSessionChange : (Value -> msg) -> Sub msg
+
+
+port storeSession : Persistent -> Cmd msg
+
+
+port windowTitle : String -> Cmd msg