Add all the files

• $ git add .
• $ git status

On branch master
 Changes to be committed:
   (use "git reset HEAD <file>..." to unstage)

   modified:   README.txt
   new file:   setup.pl

$ git commit -m"start writing the setup script"
[master 887d712] start writing the setup script
 2 files changed, 2 insertions(+)
 create mode 100644 setup.pl