The Quark PCB is a modified layout for the Planck by OLKB. It's similar to a Planck, but the bottom row was designed to be more useable-larger than 1u keys.
Make example for this keyboard (after setting up your build environment):
make quark:default
See the build environment setup and the make instructions for more information. Brand new to QMK? Start with our Complete Newbs Guide.