example: Add simple router example

examples/simple_router/config/config.exs

@@ -0,0 +1,20 @@
+# This file is responsible for configuring your application
+# and its dependencies with the aid of the Mix.Config module.
+use Mix.Config
+
+config :tres,
+  protocol: :tcp,
+  port: 6653,
+  max_connections: 10,
+  num_acceptors: 10,
+  callback_module: SimpleRouter.Openflow.Controller,
+  callback_args: []
+
+config :simple_router,
+  interfaces: %{
+    "veth1" => %{mac_address: "02:00:00:01:00:01", ip_address: "192.168.1.1/24"},
+    "veth3" => %{mac_address: "02:00:00:01:00:02", ip_address: "192.168.2.1/24"},
+  },
+  routes: %{
+    "0.0.0.0/0" => "192.168.1.2"
+  }