add wiki Usage: Forward and Realtime

@@ -54,6 +54,7 @@ cd simple-rtmp-server/trunk
 [Usage: How to delivery HLS?](https://github.com/winlinvip/simple-rtmp-server/wiki/SampleHLS)<br/>
 [Usage: How to transcode RTMP stream by FFMPEG?](https://github.com/winlinvip/simple-rtmp-server/wiki/SampleFFMPEG)<br/>
 [Usage: How to Forward stream?](https://github.com/winlinvip/simple-rtmp-server/wiki/SampleForward)<br/>
+[Usage: How to delivery low latency RTMP stream?](https://github.com/winlinvip/simple-rtmp-server/wiki/SampleRealtime)<br/>
 [Usage: How to show the demo of SRS?](https://github.com/winlinvip/simple-rtmp-server/wiki/SampleDemo)<br/>
 
 ### Architecture

+listen              1935;
+vhost __defaultVhost__ {
+    forward         127.0.0.1:19350;
+}

+listen              19350;
+vhost __defaultVhost__ {
+}

+listen              1935;
+vhost __defaultVhost__ {
+    gop_cache       off;
+    queue_length    10;
+}