从命令行创建一个新的仓库

touch README.md
git init
git add README.md
git commit -m "first commit"
git remote add origin https://bdgit.educoder.net/Q9ihs38xl/Demo.git
git push -u origin master

从命令行推送已经创建的仓库

git remote add origin https://bdgit.educoder.net/Q9ihs38xl/Demo.git
git push -u origin master