Add a quilt patch.

01-dwm.patch is a patch of patches. It consists of:
    * fancybarclickable
    * maximize
    * moveresize
    * multimon
    * swapfocus
    * viewontag

And it consists of some personal changes to config.h:
    * font
    * tagging rules
    * resizehints
    * MODKEY
    * volume control
    * screen locking
    * keybindings