add git command picture
add git command picture

mayonghui2112/helloWorld,mayonghui2112/helloWorld,mayonghui2112/helloWorld,mayonghui2112/helloWorld,mayonghui2112/helloWorld,mayonghui2112/helloWorld,mayonghui2112/helloWorld,mayonghui2112/helloWorld,mayonghui2112/helloWorld