adding new docu for the data model
adding new docu for the data model

sbliven/biojava-sbliven,pwrose/biojava,paolopavan/biojava,biojava/biojava,lafita/biojava,sbliven/biojava-sbliven,heuermh/biojava,heuermh/biojava,sbliven/biojava-sbliven,lafita/biojava,zachcp/biojava,zachcp/biojava,heuermh/biojava,fionakim/biojava,emckee2006/biojava,pwrose/biojava,lafita/biojava,emckee2006/biojava,emckee2006/biojava,JolantaWojcik/biojavaOwn,andreasprlic/biojava,paolopavan/biojava,JolantaWojcik/biojavaOwn,andreasprlic/biojava,fionakim/biojava,andreasprlic/biojava,biojava/biojava,andreasprlic/biojava,zachcp/biojava,fionakim/biojava,paolopavan/biojava,biojava/biojava,pwrose/biojava