Create another file called config.pl

$ git status
examples/out/status_06.txt
# On branch master
# Changes not staged for commit:
#   (use "git add <file>..." to update what will be committed)
#   (use "git checkout -- <file>..." to discard changes in working directory)
#
#       modified:   README.txt
#
# Untracked files:
#   (use "git add <file>..." to include in what will be committed)
#
#       config.pl
#       setup.pl
no changes added to commit (use "git add" and/or "git commit -a")

Stage it

$ git add config.pl
examples/out/status_07.txt
# On branch master
# Changes to be committed:
#   (use "git reset HEAD <file>..." to unstage)
#
#       new file:   config.pl
#
# Changes not staged for commit:
#   (use "git add <file>..." to update what will be committed)
#   (use "git checkout -- <file>..." to discard changes in working directory)
#
#       modified:   README.txt
#
# Untracked files:
#   (use "git add <file>..." to include in what will be committed)
#
#       setup.pl