git add

rm -rf .git

//to add a single file
git add <file>

//to add all changed files
git add -A

/*to add all the files in staging area at once*/
git add .

git commit -a -m "msg"

git init
git add README.md
git commit -m "first commit"
git remote add origin https://github.com/Leonuch/flex.git
git push -u origin master

git add <file> or you can do git add -A to add all files

git add