Mod: examples readme

examples/README.md

 # examples
 
-Examples of go-for-apache-dubbo
+Examples of dubbo-go
 
-## dubbo
+## overview
 
-#### Build by these command
+* helloworld
 
-java server
-```bash
-cd dubbo/java-server
-sh build.sh
-```
+    A simplest example. It contain 'go-client', 'go-server', 'java-server' of dubbo protocol. 
 
-java client
-```bash
-cd dubbo/java-client
-sh build.sh
-```
+* general
 
-go server
+    A general example. It had validated zookeeper registry and different parameter lists of service. 
+  And it has a comprehensive testing with dubbo/jsonrpc protocol. You can refer to it to create your first complete dubbo-go project.
 
-* sh ./assembly/\[os]/\[environment].sh
-```bash
-cd dubbo/go-server
-# $ARCH = [linux, mac, windows] and $ENV = [dev, release, test]
-sh ./assembly/$ARCH/$ENV.sh
-```
+* generic
 
-go client
-```bash
-cd dubbo/go-client
-# $ARCH = [linux, mac, windows] and $ENV = [dev, release, test]
-sh ./assembly/$ARCH/$ENV.sh
-```
+    A generic reference example. It show how to use generic reference of dubbo-go.
+
+* configcenter
+
+    Some examples of different config center. There is only one -- zookeeper at present.
 
-#### Run by these command:
+## How to build and run
+
+> Take `helloworld` as an example
 
 java server
+
 ```bash
-cd dubbo/java-server/target
+cd helloworld/dubbo/java-server
+sh build.sh
+
+cd ./target
 tar -zxvf user-info-server-0.2.0-assembly.tar.gz
 cd ./user-info-server-0.2.0
 sh ./bin/server.sh start
 ```
 
 java client
+
 ```bash
-cd dubbo/java-client/target
+cd helloworld/dubbo/java-client
+sh build.sh
+
+cd ./target
 tar -zxvf user-info-client-0.2.0-assembly.tar.gz
 cd ./user-info-client-0.2.0
 sh ./bin/server.sh start
 ```
 
 go server
+
+* $ARCH = [linux, mac, windows] and $ENV = [dev, release, test]
+
 ```bash
-cd dubbo/go-server/target/linux/user_info_server-0.3.1-20190517-0930-release
-#conf suffix appoint config file, 
-#such as server_zookeeper.yml when "sh ./bin/load.sh start is zookeeper", 
-#default server.yml
-sh ./bin/load.sh start [conf suffix]
+cd helloworld/dubbo/go-server
+sh ./assembly/$ARCH/$ENV.sh
+
+cd ./target/linux/user_info_server-0.3.1-20190517-0930-release
+# $SUFFIX is a suffix of config file,
+# such as server_zookeeper.yml when $SUFFIX is "zookeeper", 
+# if $SUFFIX = "", default server.yml
+sh ./bin/load.sh start $SUFFIX
 ```
 
 go client
+
+* $ARCH = [linux, mac, windows] and $ENV = [dev, release, test]
+
 ```bash
-cd dubbo/go-client/target/linux/user_info_client-0.3.1-20190517-0921-release
+cd helloworld/dubbo/go-client
+sh ./assembly/$ARCH/$ENV.sh
+
+cd ./target/linux/user_info_client-0.3.1-20190517-0921-release
 # $SUFFIX is a suffix of config file,
 # such as client_zookeeper.yml when $SUFFIX = zookeeper", 
 # if $SUFFIX = "", config file is client.yml
 sh ./bin/load_user_info_client.sh start $SUFFIX
 ```
-
-## jsonrpc
-Similar to dubbo