modify readme file (#14)

Modify readme file make it more Github style and add How to build section.

README → README.md

@@ -1,7 +1,4 @@
-ukui-sidebar
-= = = = = = = = = = =
-
-
+# ukui-sidebar
 The sidebar mainly consists of two parts: notification center and cutting board. It starts from the start-up and is placed in the tray bar in the form of a tray. After clicking, it can pop up dynamically from the right side of the screen.
 
   + The notification center can display the pop-up messages sent by each application to mate notification teamon in a list form. Unimportant information can be stored in the storage box for viewing. At the same time, it can call the control panel directly.
@@ -11,14 +8,10 @@ The sidebar mainly consists of two parts: notification center and cutting board.
 
 The ukui-sidebar is a shortcut tool on the right side of the screen for UKUI.
 
-How to test notification-center
-==================
-
-notify-send -a wechat -i "/home/ccn/heart.png" Summary Body
-
-How to report bugs
-==================
+# How to test notification-center
+`notify-send -a wechat -i "/home/ccn/heart.png" Summary Body`
 
+# How to report bugs
 Bugs should be reported to the UKUI bug tracking system:
 
 	https://github.com/ukui/ukui-sidebar/issues
@@ -27,3 +20,26 @@ You will need to create an account for yourself.
 
 Please read the HACKING file for information on where to send changes or
 bugfixes for this package.
+
+# How to build
+## Preparation
+You can build pre-depends with such command:
+
+`sudo apt install libglib2.0-dev qtbase5-dev libqt5svg5-dev qttools5-dev-tools`
+
+Note: build-depends references the paragraph in debian/control.
+
+## Build from source and test
+
+> git clone https://github.com/ukui/ukui-sidebar
+
+> cd ukui-sidebar && mkdir build && cd build
+
+> qmake .. && make
+
+> sudo make install
+
+Note: If you want to run ukui-sidebar, you need to make some changes in the code after build.
+  + Find `libnotification_plugin.so` in your build path like `/home/XX/ukui-sidebar/build/src/plugins/notification_plugins`. Then set this path as pluginDir in file widget.cpp fuction `bool Widget::loadNotificationPlugin()`.
+
+  + Find `libclipboardPlugin.so` in your build path like `/home/XX/ukui-sidebar/build/src/plugins/sidebar_pushbutton_plugins`. Then set this path as pluginDir in file pluginmanage.cpp fuction `PluginManager::PluginManager(QObject *parent) : QObject(parent)`.