update readme, add csdn mirror

 #Simple-RTMP-Server
 
-You can [Download Released SRS(下载发布版)](http://winlinvip.github.io/srs.release/releases/)
+[下载发布版(github): Download Released SRS from github](http://winlinvip.github.io/srs.release/releases/)
 
-Or download from [chnvideo mirror(国内镜像)](http://demo.chnvideo.com:8085/srs/releases/)
+[下载发布版(国内阿里云镜像): Download Realeased SRS from chnvideo mirror](http://demo.chnvideo.com:8085/srs/releases/)
+
+[获得源码(github): Checkout SRS source from github](https://github.com/winlinvip/simple-rtmp-server)
+
+```bash
+git clone https://github.com/winlinvip/simple-rtmp-server.git
+```
+
+[获得源码(国内CSDN镜像): Checkout SRS source from CSDN](https://code.csdn.net/winlinvip/srs-csdn/events)
+
+```bash
+git clone https://code.csdn.net/winlinvip/srs-csdn.git
+```
 
 ## About
 

@@ -42,13 +42,6 @@ git checkout master && git merge srs.master
 ret=$?; if [[ 0 -ne $ret ]]; then failed_msg "合并github分支失败, ret=$ret"; exit $ret; fi
 ok_msg "合并github分支成功"
 
-git commit -a -m "merge from github.srs"
-ret=$?; if [[ 0 -ne $ret ]]; then 
-    warn_msg "提交CSDN失败，忽略, ret=$ret";
-else
-    ok_msg "提交CSDN成功"
-fi
-
 for ((;;)); do 
     git push
     ret=$?; if [[ 0 -ne $ret ]]; then