SCB-395 add guides to build executable files

README.md

@@ -23,8 +23,7 @@ See [Saga Pack Design](docs/design.md) for details.
 See [Booking Demo](saga-demo/booking/README.md) for details.
 
 ## User Guide
-See [User Guide](docs/user_guide.md) for details.
-
+How to build and use can refer to [User Guide](docs/user_guide.md).
 
 ## FAQ
 * [How to use MySQL as alpha's backend database?](docs/faq/en/how_to_use_mysql_as_alpha_backend_database.md)

README_ZH.md

@@ -23,7 +23,7 @@ Saga是由 **alpha** 和 **omega**组成，其中：
 详情可浏览[出行预订示例](saga-demo/booking/README.md)。
 
 ## 用户指南
-详情可浏览[用户指南](docs/user_guide_zh.md)。
+如何构建和使用可浏览[用户指南](docs/user_guide_zh.md)。
 
 ## 常见问题
 * [如何使用MySQL作为alpha的后台数据库？](docs/faq/cn/how_to_use_mysql_as_alpha_backend_database.md)

docs/user_guide.md

@@ -12,7 +12,27 @@ You will need:
 [docker]: https://www.docker.com/get-docker
 
 ## Build
-To build:
+
+Retrieve the source code:
+```bash
+$ git clone https://github.com/apache/incubator-servicecomb-saga.git
+$ cd incubator-servicecomb-saga
+```
+
+Saga can be built in either of the following ways.
+* Only build the executable files.
+   ```bash
+   $ mvn clean install -DskipTests
+   ```
+
+* build the executable files along with docker image.
+   ```bash
+   $ mvn clean install -DskipTests -Pdocker
+   ```
+
+After executing either one of the above command, you will find alpha server's executable file in `alpha/alpha-server/target/saga/alpha-server-${version}-exec.jar`.
+
+### Build executable files and docker images
 ```bash
 $ git clone https://github.com/apache/incubator-servicecomb-saga.git
 $ cd incubator-servicecomb-saga

docs/user_guide_zh.md

@@ -11,13 +11,26 @@
 [docker]: https://www.docker.com/get-docker
 
 ## 编译
-编译Saga，只需以下几步：
+
+获取源码：
 ```bash
 $ git clone https://github.com/apache/incubator-servicecomb-saga.git
 $ cd incubator-servicecomb-saga
-$ mvn clean install -DskipTests -Pdocker
 ```
 
+Saga可通过以下任一方式进行构建：
+* 只构建可执行文件：
+   ```bash
+   $ mvn clean install -DskipTests
+   ```
+
+* 同时构建可执行文件和docker镜像：
+   ```bash
+   $ mvn clean install -DskipTests -Pdocker
+   ```
+
+在执行以上任一指令后，可在`alpha/alpha-server/target/saga/alpha-server-${version}-exec.jar`中找到alpha server的可执行文件。
+
 ## 如何使用
 ### 引入Saga的依赖
 ```xml