Add sfu example with websocket

sfu example with websocket, support video and audio. easy to use

Resolves #507

examples/sfu-ws/main.go

@@ -0,0 +1,47 @@
+package main
+
+import (
+	"flag"
+	"fmt"
+	"net/http"
+
+	"github.com/pions/webrtc"
+)
+
+func checkError(err error) {
+	if err != nil {
+		panic(err)
+	}
+}
+
+func init() {
+
+	// Generate pem file for https
+	genPem()
+
+	// Create a MediaEngine object to configure the supported codec
+	m = webrtc.MediaEngine{}
+
+	// Setup the codecs you want to use.
+	m.RegisterCodec(webrtc.NewRTPVP8Codec(webrtc.DefaultPayloadTypeVP8, 90000))
+	m.RegisterCodec(webrtc.NewRTPOpusCodec(webrtc.DefaultPayloadTypeOpus, 48000))
+
+	// Create the API object with the MediaEngine
+	api = webrtc.NewAPI(webrtc.WithMediaEngine(m))
+
+}
+
+func main() {
+	port := flag.String("p", "8443", "https port")
+	flag.Parse()
+
+	// Websocket handle func
+	http.HandleFunc("/ws", room)
+
+	// Html handle func
+	http.HandleFunc("/", web)
+
+	// Support https, so we can test by lan
+	fmt.Println("Web listening :" + *port)
+	panic(http.ListenAndServeTLS(":"+*port, "cert.pem", "key.pem", nil))
+}