Begin working on Http requests.

src/Scylla/Model.elm

@@ -0,0 +1,21 @@
+module Scylla.Model exposing (..)
+import Scylla.Api exposing (..)
+import Scylla.Sync exposing (SyncResponse)
+import Scylla.Login exposing (LoginResponse)
+import Browser.Navigation as Nav
+import Browser
+import Http
+import Url exposing (Url)
+
+type alias Model =
+    { key : Nav.Key
+    , token : Maybe ApiToken
+    , apiUrl : ApiUrl
+    }
+
+type Msg =
+    TryUrl Browser.UrlRequest
+    | ChangeUrl Url
+    | ReceiveSyncResponse (Result Http.Error SyncResponse)
+    | ReceiveLoginResponse (Result Http.Error LoginResponse)
+