Remove native characters in README. reviewed by @vongosling

bin/README.md

-### 操作系统调优
-在生产环境部署Broker前，必须要执行os.sh，对操作系统进行调优
+### Operating system tuning
+Before the broker deployment, you must run **os.sh**, which is optimized for your operating system.
 
-**P.S: os.sh只能执行一次，需要sudo root权限**
+## Notice
+### os.sh should be executed only once with the root permission.
+### os.sh parameter settings is just for reference. You can tune it in your target host systems.
 
-### 启动broker
-* Unix平台
+
+### Start broker
+* Unix platform
 
   `nohup sh mqbroker &`
 
-* Windows平台（仅支持64位）
+* Windows platform（Only support 64 bit）
 
   `mqbroker.exe`
 
-### 关闭broker
+### Shutodwn broker
   sh mqshutdown broker
 
-### 启动Name Server
-* Unix平台
+### Start Nameserver
+* Unix platform
 
   `nohup sh mqnamesrv &`
 
-* Windows平台（仅支持64位）
+* Windows platform（Only support 64 bit）
 
   `mqnamesrv.exe`
 
-### 关闭Name Server
+### Shutdown Nameserver
     sh mqshutdown namesrv
 
-### 更新或创建Topic
+### Update or create Topic
     sh mqadmin updateTopic -b 127.0.0.1:10911 -t TopicA
 
-### 更新或创建订阅组
+### Update or create subscription group
     sh mqadmin updateSubGroup -b 127.0.0.1:10911 -g SubGroupA
\ No newline at end of file