其实这个内容就是git如何添加和使用远程库
(一)使用ssh协议：
（1）首先使用:ssh-keygen -t rsa来产生公钥和私钥，默认目录是~/.ssh
当然，在设置过程中你也可以自己选择存放目录，不过没必要更改。
（2）将生成的id_rsa.pub的内容复制到github网站的，account setting->ssh keys
（二）https协议
上一步有可能会出现：ssh: connect to host github.com port 22: Connection timed out
这时候就采用http协议，但是会很慢很慢。
具体参考：
The reason could be the firewall modification as you are under a network.(In which case they may deliberately block some ports)
To double check if this is the reason ... do
ssh -T git@github.com
this should timeout. If that's the case use http protocol instead of ssh this way
just change your url in the config file to http.
Here is how :-
git config --local -e
change entry of
url = git@github.com:username/repo.git
to
url = https://github.com/username/repo.git
另外，在github网站上也有介绍。https://help.github.com/articles/set-up-git