To add all untracked files git command is
git add -A
Also if you want to get more details about various available options , you can type command
git add -i
instead of first command , with this you will get more options including option to add all untracked files as shown below :
$ git add -i warning: LF will be replaced by CRLF in README.txt. The file will have its original line endings in your working directory. warning: LF will be replaced by CRLF in package.json.
* Commands * 1: status 2: update 3: revert 4: add untracked 5: patch 6: diff 7: quit 8: help What now> a