add recipe for evil-god-state

[evil-god-state][] adds an evil command to switch to [god-mode][] for
the next command. This enables an "automatically configured" leader key
for evil-mode.

I am the author. This is my first time writing a package.el package, but
`make recipes/evil-god-state` seems to work, so hopefully everything is
in order :)

[evil-god-state]: https://github.com/gridaphobe/evil-god-state
[god-mode]: https://github.com/chrisdone/god-mode