git-add --verbose should say when something is already indexed
From: <hidden> Date: 2016-06-15 22:45:50
git-add or at least git-add --verbose should say upon
$ git-add bla.txt
$ git-add bla.txt
bla.txt is already in the index.
The git-add man page should mention how one can see all the files
added, perhaps by git-ls-files. If so mention in SEE ALSO too.