添加别名的方式：
linux: vim ~/.gitconfig ，末尾添加 Windows: 在用户目录下， .gitconfig 文件，末尾添加
添加内容：
[alias]
a = add
b = branch
c =
commit
ci = commit
d = diff
st = status
lg = log --graph --pretty=format:'%Cred%h%Creset -%C(yellow)%d%Creset %s %Cgreen(%cr)%Creset | %C(bold)%an' --abbrev-commit --date=relative
r = reset
aa = add .
ba = branch -a
ca = commit -a
cc = commit -a -m
cl = clone
cm = commit -m
co = checkout
cp = cherry-pick
nb = checkout -b
pl = pull
ps = push origin master
