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.
See the [build environment setup](https://docs.qmk.fm/#/getting_started_build_tools) and the [make instructions](https://docs.qmk.fm/#/getting_started_make_guide) for more information. Brand new to QMK? Start with our [Complete Newbs Guide](https://docs.qmk.fm/#/newbs).