Added the first version of the design document.
Added the first version of the design document.

KaranDagar/crystalvc,brunyuriy/crystalvc,SoftwareEngineeringToolDemos/FSE-2011-Crystal,SoftwareEngineeringToolDemos/FSE-2011-Crystal,brunyuriy/crystalvc,SoftwareEngineeringToolDemos/FSE-2011-Crystal,KaranDagar/FSE-2011-Crystal---old,KaranDagar/FSE-2011-Crystal---old,KaranDagar/crystalvc