update readme with grunt tasks
update readme with grunt tasks

bgrins/spectrum,ajssd/spectrum,liitii/spectrum,ajssd/spectrum,inscriptionweb/spectrum,ginlime/spectrum,bgrins/spectrum,inscriptionweb/spectrum,safareli/spectrum,kotmatpockuh/spectrum,kotmatpockuh/spectrum,CodeLoversAt/spectrum,shawinder/spectrum,baiyanghese/slides-spectrum,c9s/spectrum,ginlime/spectrum,Rise-Vision/spectrum,GerHobbelt/spectrum,liitii/spectrum,armanforghani/spectrum,armanforghani/spectrum,GerHobbelt/spectrum,safareli/spectrum,maurojs25/spectrum,hakimel/slides-spectrum,shawinder/spectrum,maurojs25/spectrum