feat: first take at UI app

lib/bds/desktop.ex

@@ -0,0 +1,12 @@
+defmodule BDS.Desktop do
+  @moduledoc false
+
+  def url do
+    Application.get_env(:bds, :desktop)[:port]
+    |> url()
+  end
+
+  def url(port) when is_integer(port) do
+    "http://127.0.0.1:#{port}/"
+  end
+end