'git add' [-n] [-v] [--force | -f] [--interactive | -i] [--patch | -p]
[--update | -u] [--refresh] [--ignore-errors] [--]
+ [--update | -u] [--refresh] [--ignore-errors] [--]
command line. If no paths are specified, all tracked files in the
current directory and its subdirectories are updated.
+ Update files that git already knows about (same as '\--update')
+ and add all untracked files that are not ignored by '.gitignore'
Don't add the file(s), but only refresh their stat()
information in the index.