Adds module to parse arguments passed to mediate

lib/options.ex

@@ -0,0 +1,16 @@
+defmodule Options do
+
+  def parse([]), do: defaults
+  def parse(args) do
+    Enum.reduce(args, defaults, fn(arg, acc) ->
+      Map.merge(acc, parse_argument(arg))
+    end)
+  end
+
+  def parse_argument("--clear-screen"), do: %{ clear_screen: true}
+  def parse_argument(_), do: %{}
+
+  defp defaults do
+    %{ clear_screen: false}
+  end
+end