How to make Atom open when I type "git commit"

When I type git commit Atom should open, but it doesn't.

For the configuration on command prompt, I typed:

config --global core.editor "atom --wait"

When I type:

git commit

It says:

hint: waiting for your editor to close the file .......error: there was a problem with the editor  "atom --wait"Please supply the message using either -m or -F option.