readme: Add instructions for using a .mk file
readme: Add instructions for using a .mk file

kklin/quilt,PenguinToast/quilt,ZhongtianWang/quilt,kklin/kelda,LuiseV/quilt,PenguinToast/quilt,tejasmanohar/quilt,mmussomele/quilt,kayousterhout/quilt,NetSys/quilt,stevenlin598/quilt,mmussomele/quilt,kelda/kelda,ZhongtianWang/quilt,ejj/quilt-dev,mmussomele/quilt,quilt/quilt,kklin/quilt,kklin/kelda,secant/quilt,mmussomele/quilt,akshayknarayan/quilt,LuiseV/quilt,secant/quilt,LuiseV/quilt,tejasmanohar/quilt,NetSys/quilt,kklin/quilt,ejj/quilt-dev,akshayknarayan/quilt,kayousterhout/quilt,kayousterhout/quilt,ZhongtianWang/quilt,NetSys/quilt,kelda/kelda,tejasmanohar/quilt,stevenlin598/quilt,LuiseV/quilt,secant/quilt,akshayknarayan/quilt,mmussomele/quilt,quilt/quilt,LuiseV/quilt,ZhongtianWang/quilt,kklin/kelda,secant/quilt,PenguinToast/quilt,NetSys/quilt,stevenlin598/quilt,kelda/kelda,NetSys/quilt,quilt/quilt,mmussomele/quilt,stevenlin598/quilt,ejj/quilt-dev,kayousterhout/quilt,PenguinToast/quilt,secant/quilt,kklin/quilt,akshayknarayan/quilt,stevenlin598/quilt,PenguinToast/quilt,stevenlin598/quilt,kelda/kelda,quilt/quilt,kklin/kelda,tejasmanohar/quilt,ejj/quilt-dev