git init

git remote add origin 项目地址

git add .

git commit -m "注释"

git push origin master

出现错误 

$ git push origin master

To https://gitee.com/heguxin/XXX

 ! [rejected]        master -> master (fetch first)

error: failed to push some refs to 'https://gitee.com/heguxin/XXX

hint: Updates were rejected because the remote contains work that you do

hint: not have locally. This is usually caused by another repository pushing

hint: to the same ref. You may want to first integrate the remote changes

hint: (e.g., 'git pull ...') before pushing again.

hint: See the 'Note about fast-forwards' in 'git push --help' for details.

解决方法：

git pull --rebase origin master

git push origin master