Integrating howdy, a Windows Hello like into GDM?

[Luya Tshimbalanga <luya fedoraproject org>]

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Hello team,

Since owning the HP Envy x360 Convertible from last month, with the help
of both Hans and Peter Hutterer, we managed to improve a better
touchscreen and stylus experience on that hardware. As written on my
blog
(https://blog.thefinalzone.net/2018/11/enable-stylus-settings-on-hp-envy-x360.html),
it would be nice to integrate a Windows Hello type authentication into
the login screen similar to Windows 10 or Samsung Galaxy S9 series using
iris authentication.

I have already packaged in the COPR repository
(https://copr.fedorainfracloud.org/coprs/luya/howdy/) and would like
much help to further improve the changes while carrying them upstream
(https://github.com/boltgolt/howdy) before submitting for packaging review.

Additionally, setting a nice user interface instead of cli would be
great for an overall better user experience. The benefit is great for
both Fedora and GNOME (other desktop environments are welcome to
contribute) for providing an alternate way of authentication.

Feedback and suggestion welcome.

Luya

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