added screenshot to readme
added screenshot to readme

alvinvarghese/specta,lmtim/specta,ernestopino/specta,github/specta,PatrykKaczmarek/specta,Vungle/specta,adamkaplan/specta,flovilmart/specta,wessmith/specta,dbarden/specta,segiddins/specta,ashfurrow/specta,jmoody/specta,Lightricks/specta,iguchunhui/specta,hanangellove/specta,ExtremeMan/specta,rad3ks/specta,mickeyreiss/specta,iosdev-republicofapps/specta,ShawnLeee/specta,Taptera/specta,specta/specta