Add the implement of the SaveImageInJEPG function.
Add the tools.
Add the implement of the Screenshot function.
Add the implement of the OnMouse function.
Fixed the bug that the program terminaled when the mouse is out of the
image window.
Added the implement of the DrawRectangle function.
Add the implement of the MakingRectanglePoint function.
Add the userdata struct.
Add the code to deal with the event of mouse moving.
Add the code to deal with exc, next image and front image.
Add some comment in the Screenshot function.
Add some implement of the Screenshot function.
Add the readme file and the license.