learn to use Qt Git.
V1.0
add okBtn
v1.1
add two button
V1.2
add Miss you
fixup! v1.1 add two button
v1.2B

实现了按钮关闭，信号与槽的连接
issue 101
练习到添加远程库那里了，

遇到的问题：Qt中Push远程库出错，无法添加！
Merge branch 'master' of github.com:CarlosLei/Hello