Import spectrwm-2.3.0 as wip/spectrwm.  Submitted by Michael Danilov.

Spectrwm is a small dynamic tiling window manager for X11. It tries
to stay out of the way so that valuable screen real estate can be
used for much more important stuff. It has sane defaults and does
not require one to learn a language to do any configuration. It
was written by hackers for hackers and it strives to be small,
compact and fast.
add spectrwm