How to stage all modified and new files with vim-fugitive

I know that you can use GWrite to stage current file. You can also use GStatus and - to stage the file you are selecting.

Is there a way to GWrite all the files or do git add . without using GStatus ?

See :h :Git, which can

Run an arbitrary git command. Similar to :!git [args] but chdir to the repository tree first.

:Git add .