Create README.md

There are two classes in this project.
Statebanner is mainly used for displaying state and volumes,whick in fact doesn't know anything about the recording.
To use Statebanner,just set the property of the statebanner in the proper time.
GestureView is a class,whick observers your touching down or touching up or end of the gesture,it also captures 
drag gesture and post the event to it's delegate along with the gesture point in view.
You can use these two classes to create a TouchAndRecordOrCancel project like WEIXIN.