Update readme

README.md

@@ -1,22 +1,27 @@
 # webcc
 
-A lightweight C++ REST and SOAP client and server library based on Boost.Asio.
+A lightweight C++ REST and SOAP client and server library based on *Boost.Asio*.
 
-## Tutorials
+Please see the `doc` folder for tutorials and `example` folder for examples.
 
-**SOAP:**
+## Build Instructions
-- [SOAP Client Tutorial](doc/SoapClientTutorial.md)
-- [SOAP Server Tutorial](doc/SoapServerTutorial.md)
 
-- [SOAP 客户端教程](doc/SoapClientTutorial_zh-CN.md)
+A lot of C++11 features are used, e.g., `std::move`. But C++14 is not required. It means that you can still build `webcc` using VS2013.
 
-## Dependencies
+[CMake 3.1.0+](https://cmake.org/) is required as the build system. But if you don't use CMake, you can just copy the `src/webcc` folder to your own project then manage it by yourself.
 
-- C++11
+[C++ Boost](https://www.boost.org/) should be 1.66+ because Asio made some broken changes to the API in 1.66.
-- Boost 1.66+
 
-If enable SOAP support, **pugixml** is needed to parse and compose XML strings.
+### Build Options
 
-## Build
+The following CMake options determine how you build the projects. They are quite self-explanatory.
 
-The build system is CMake.
+```cmake
+option(WEBCC_ENABLE_LOG "Enable console logger?" ON)
+option(WEBCC_ENABLE_SOAP "Enable SOAP support (need pugixml)?" ON)
+option(WEBCC_BUILD_UNITTEST "Build unit test?" ON)
+option(WEBCC_BUILD_REST_EXAMPLE "Build REST example?" ON)
+option(WEBCC_BUILD_SOAP_EXAMPLE "Build SOAP example?" ON)
+```
+
+If `WEBCC_ENABLE_SOAP` is `ON`, **pugixml** (already included) is used to parse and compose XML strings.