stroker: add algorithm description
stroker: add algorithm description

astiob/libass,astiob/libass,ShiftMediaProject/libass,Akemi/libass,MrSmile/libass,xbmc/libass,ShiftMediaProject/libass,Akemi/libass,libass/libass,MrSmile/libass,xbmc/libass,Akemi/libass,libass/libass