Set up basic web application template

src/CacheSim/Model.elm

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+module CacheSim.Model exposing (..)
+
+type alias Model = ()
+type alias Flags = ()
+type alias Msg = ()

src/Main.elm

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+import CacheSim.Model exposing (..)
+import Browser exposing (Document, document)
+import Html exposing (text)
+
+init : Flags -> (Model, Cmd Msg)
+init f = ((), Cmd.none)
+
+view : Model -> Document Msg
+view m =
+    { title = "Cache Simulator"
+    , body = [ text "Hello, world!" ]
+    }
+
+update : Msg -> Model -> (Model, Cmd Msg)
+update msg m = (m, Cmd.none)
+
+subscriptions : Model -> Sub Msg
+subscriptions m = Sub.none
+
+main = document
+    { init = init
+    , view = view
+    , update = update
+    , subscriptions = subscriptions
+    }