example: Add simple router example (#12)

examples/simple_router/mix.exs

@@ -0,0 +1,27 @@
+defmodule SimpleRouter.MixProject do
+  use Mix.Project
+
+  def project do
+    [
+      app: :simple_router,
+      version: "0.1.0",
+      elixir: "~> 1.7",
+      start_permanent: Mix.env() == :prod,
+      deps: deps()
+    ]
+  end
+
+  def application do
+    [
+      extra_applications: [:logger, :tres, :pkt],
+      mod: {SimpleRouter.Application, []}
+    ]
+  end
+
+  defp deps do
+    [
+      {:tres, path: "../../../tres"},
+      {:pkt, github: "msantos/pkt"}
+    ]
+  end
+end