add an issue template
add an issue template

There have always been a lot of questions-via-issues, but recently there
have also been a lot of issues where the first round trip is "please post
your config" or "please elaborate". Let's try to head that off with an
issue template.

Signed-off-by: Tycho Andersen <6b523322678240882acbb4da5312a12d8cd0082d@tycho.ws>

qtile/qtile,ramnes/qtile,tych0/qtile,qtile/qtile,tych0/qtile,ramnes/qtile