git configure user and mailbox

1. Check the git user profile

git config user.name

2. Check the mailbox configuration git

git config user.email

3. Configure git users

git config --global user.name "Your name"

4. Configure git-mail

git config --global user.email "Your eamil"

PS: If these things are not configured, you submit code will be displayed on github is committed by someone else! ! !