update readme

@@ -39,6 +39,11 @@ step 5: play live stream <br/>
 rtmp url: rtmp://127.0.0.1:1935/live/livestream
 m3u8 url: http://127.0.0.1:80/live/livestream.m3u8
 </pre>
+step 6: play live stream auto transcoded<br/>
+<pre>
+rtmp url: rtmp://127.0.0.1:1935/live/livestream_fast
+m3u8 url: http://127.0.0.1:80/live/livestream_fast.m3u8
+</pre>
 
 ### System Requirements
 Supported operating systems and hardware: