modify README, add useages into it

README.md

@@ -1,3 +1,50 @@
+I've been using Qt for a while, the lack of UI framework is a big problem for me.
+
+After building UI components from scratch for a while, I decided to try reusing other's projects, that is no piece of cake.
+
+I found [qt-material-widgets](https://github.com/laserpants/qt-material-widgets), but sadly it seems to be no longer supported.
+
+Pull requests from other developer, such as [move to cmake](https://github.com/laserpants/qt-material-widgets/pull/50) which inspired me on migrating this project from `qmake` to `CMake`, are not accepted anymore.
+
+I'm very honored to try to take over the maintenance of this project, and welcome all pull requests and issues.
+
+# Overview
+
+The original project only supports the qmake build system on Linux platform.
+
+The new project will support both qmake and CMake on as many platforms as possible, mainly Windows, Android ,Linux and MacOS.
+
+
+# Usage
+
+### 1. clone this project
+
+### 2. create your widgets app
+
+Create *Qt Widgets Application* with CMake project as normal
+
+### 3. modify CMakeLists.txt of your app
+
+First, add *component* as subdirectory of your project
+
+```CMake
+add_subdirectory(/path/to/qt-material-widgets/components/ ./components)
+```
+
+I'm not sure if these two line is really needed, you can add them when you count error
+
+```CMake
+set(CMAKE_INCLUDE_CURRENT_DIR ON) # I'm not sure if it is really needed
+set(CMAKE_EXPORT_COMPILE_COMMANDS ON) # I'm not sure if it is really needed
+```
+
+then, add *include* and *link libraries*:
+
+- add `/path/to/qt-material-widgets/include/qmeterial/` into `target_include_directories` for headers
+- add `components` into `target_link_libraries` for `.lib`
+
+Now you can use *qt-material-widgets*, all components list as follows:
+
 # Qt Material Design Desktop Widgets [![Language](https://img.shields.io/badge/language-c++-brightgreen.svg)]() [![Join the chat at https://gitter.im/qt-material-widgets/Lobby](https://badges.gitter.im/qt-material-widgets/Lobby.svg)](https://gitter.im/qt-material-widgets/Lobby?utm_source=badge&utm_medium=badge&utm_campaign=pr-badge&utm_content=badge)
 
 YouTube video preview [available here](http://www.youtube.com/watch?v=21UMeNVBPU4).