Add first file

• index
• staging area
• cache
• add

Add the file(s) to the index (or staging area, or cache) and check the status again.

$ git add README.txt
$ git status

# On branch master
#
# Initial commit
#
# Changes to be committed:
#   (use "git rm --cached <file>..." to unstage)
#
#       new file:   README.txt
#