Untracked and Modified
Create another file called setup.pl with a single line and also change the README file.
$ git status
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)
      setup.pl
no changes added to commit (use "git add" and/or "git commit -a")