add websocket example

examples/websocket/src/toppage_handler.erl

@@ -0,0 +1,24 @@
+%% Feel free to use, reuse and abuse the code in this file.
+
+-module(toppage_handler).
+
+-export([init/3]).
+-export([handle/2]).
+-export([terminate/3]).
+
+init(_Transport, Req, []) ->
+	{ok, Req, undefined}.
+
+handle(Req, State) ->
+	Html = get_html(),
+	{ok, Req2} = cowboy_req:reply(200, [], Html, Req),
+	{ok, Req2, State}.
+
+terminate(_Reason, _Req, _State) ->
+	ok.
+
+get_html() ->
+	{ok, Cwd} = file:get_cwd(),
+	Filename =filename:join([Cwd, "priv", "html_ws_client.html"]),
+	{ok, Binary} = file:read_file(Filename),
+	Binary.