Add an Hello World example

examples/hello_world/src/hello_world_app.erl

@@ -0,0 +1,26 @@
+%% Feel free to use, reuse and abuse the code in this file.
+
+%% @private
+-module(hello_world_app).
+-behaviour(application).
+
+%% API.
+-export([start/2]).
+-export([stop/1]).
+
+%% API.
+
+start(_Type, _Args) ->
+	Dispatch = [
+		{'_', [
+			{[], toppage_handler, []}
+		]}
+	],
+	{ok, _} = cowboy:start_listener(http, 100,
+		cowboy_tcp_transport, [{port, 8080}],
+		cowboy_http_protocol, [{dispatch, Dispatch}]
+	),
+	hello_world_sup:start_link().
+
+stop(_State) ->
+	ok.