Add GitHub workflows for Windows #33

Job	Run time
matrix-linux / Build against Qt 5 on debian:stable	1m 6s
matrix-windows / Build against Qt 5.15.* on Windows	4m 49s
matrix-linux / Build against Qt 6 on debian:stable	1m 11s
matrix-windows / Build against Qt 6.6.* on Windows	7m 8s
matrix-linux / Build against Qt 5 on debian:testing	1m 3s
matrix-linux / Build against Qt 6 on debian:testing	1m 37s
matrix-linux / Build against Qt 5 on fedora:38	2m 16s
matrix-linux / Build against Qt 6 on fedora:38	2m 7s
matrix-linux / Build against Qt 5 on fedora:39	2m 16s
matrix-linux / Build against Qt 6 on fedora:39	1m 54s
matrix-linux / Build against Qt 5 on fedora:rawhide	1m 46s
matrix-linux / Build against Qt 6 on fedora:rawhide	1m 49s
matrix-linux / Build against Qt 5 on ubuntu:latest	1m 9s
matrix-linux / Build against Qt 6 on ubuntu:latest	56s
matrix-linux / Build against Qt 5 on ubuntu:rolling	1m 0s
matrix-linux / Build against Qt 6 on ubuntu:rolling	1m 4s
	33m 11s

Provide feedback