Users.md: add qboot [skip ci]
Users.md: add qboot [skip ci]

It's worth to list a meson project building a firmware.
QuLogic/meson,mesonbuild/meson,becm/meson,pexip/meson,QuLogic/meson,pexip/meson,mesonbuild/meson,mesonbuild/meson,mesonbuild/meson,mesonbuild/meson,QuLogic/meson,jpakkane/meson,pexip/meson,becm/meson,becm/meson,pexip/meson,QuLogic/meson,jpakkane/meson,QuLogic/meson,becm/meson,becm/meson,pexip/meson,jpakkane/meson,jpakkane/meson,mesonbuild/meson,QuLogic/meson,QuLogic/meson,pexip/meson,becm/meson,QuLogic/meson,jpakkane/meson,pexip/meson,pexip/meson,jpakkane/meson,mesonbuild/meson,jpakkane/meson,jpakkane/meson,becm/meson,becm/meson,jpakkane/meson,pexip/meson,becm/meson,mesonbuild/meson,pexip/meson,becm/meson,mesonbuild/meson,QuLogic/meson,mesonbuild/meson