Woonsocket, Rhode Island, a city of roughly 45,000 people near the Massachusetts border, has just one full-scale grocery store: a PriceRite located three miles from the city center. Getting there can be difficult for residents in one of the state’s poorest cities. With more than 40% of Woonsocket households earning less than $35,000 a year, and with 18% of residents having no access to a car, many families are stranded in what officials call a …