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