EDWARDSVILLE — For many first-time buyers, the biggest barrier to homeownership isn’t finding the right house — it’s coming up with the cash to get in the door. In Madison County, a local program aims to close that gap, offering financial assistance to help residents move from renting to homeownership.The Madison County HOMEbuyer Assistance Program provides eligible applicants up to $15,000 to assist with down payment and closing costs, easing o…