Add build instructions.
Add build instructions.

HackPlan/quark-shell-mac,baxrob/quark-shell-mac,HackPlan/quark-shell-mac,xhacker/quark-shell-mac,xhacker/quark-shell-mac,xhacker/quark-shell-mac,baxrob/quark-shell-mac,baxrob/quark-shell-mac