update readme

@@ -16,7 +16,7 @@ who is the contributors: <br/>
 2. the name of all contributors will send in the response of NetConnection.connect and metadata. 
 
 ### Usage(simple)
-<strong>step 1:</strong> get srs <br/>
+<strong>step 0:</strong> get srs <br/>
 <pre>
 tar xf simple-rtmp-server-*.*.tar.gz
 cd simple-rtmp-server-*.*/trunk
@@ -26,11 +26,11 @@ or get the latest code:<br/>
 git clone https://github.com/winlinvip/simple-rtmp-server
 cd simple-rtmp-server/trunk
 </pre>
-<strong>step 2:</strong> build and start srs all demo features.<br/>
+<strong>step 1:</strong> build and start srs all demo features.<br/>
 <pre>
 bash scripts/demo.sh
 </pre>
-<strong>step 3:</strong> srs live show: [http://demo.srs.com/players](http://demo.srs.com/players) <br/>
+<strong>step 2:</strong> srs live show: [http://demo.srs.com/players](http://demo.srs.com/players) <br/>
 requires client add server ip to hosts. <br/>
 <pre>
 # edit the folowing file:
@@ -39,22 +39,28 @@ requires client add server ip to hosts. <br/>
 # where server ip is 192.168.2.111
 192.168.2.111 demo.srs.com
 </pre>
-<strong>step 4:</strong> stop srs demo<br/>
+<strong>step 3:</strong> stop srs demo<br/>
 <pre>
 bash scripts/stop.sh
 </pre>
 
 ### Usage(detail)
-<strong>step 1:</strong> build srs <br/>
+<strong>step 0:</strong> get srs <br/>
 <pre>
 tar xf simple-rtmp-server-*.*.tar.gz
 cd simple-rtmp-server-*.*/trunk
-./configure --with-ssl --with-hls --with-ffmpeg --with-http
-make
 </pre>
 or get the latest code:<br/>
 <pre>
-git clone  https://github.com/winlinvip/simple-rtmp-server
+git clone https://github.com/winlinvip/simple-rtmp-server
+cd simple-rtmp-server/trunk
+</pre>
+<strong>step 1:</strong> build srs <br/>
+<pre>
+./configure --with-ssl --with-hls --with-ffmpeg --with-http && make
+</pre>
+or get the latest code:<br/>
+<pre>
 cd simple-rtmp-server/trunk
 ./configure --with-ssl --with-hls --with-ffmpeg --with-http
 </pre>