update readme

@@ -4,11 +4,16 @@ simple-rtmp-server
 simple rtmp origin live server over state-threads.<br/>
 can be used as origin server, or rtmp-server for encoder.
 
+Summary:<br/>
+srs is a simple, high-performance, running in single process, <br/>
+origin live server, with single vhost(like FMS \_\_defaultVhost\_\_).<br/>
+
+Features:<br/>
 1. simple: also stable enough.
 2. high-performance: single-thread, async socket, event/st-thread driven.
-3. support origin only, no edge mode.
-4. only for live streaming.
-5. donot support vhost, \_\_defaultVhost\_\_ only.
-6. single process, no multiple processes yet.
+3. no edge server, origin server only.
+4. no vod streaming, live streaming only.
+5. no vhost, \_\_defaultVhost\_\_ only.
+6. no multiple processes, single process only.
 
 Winlin