After a strong showing of support for the new winter farmers market in Coolidge Corner, organizers have announced the market will also be open on Mondays from 11:30 a.m. to 6:30 p.m. beginning this week. The market has been open inside the Arcade Building at 318 Harvard St. on Sundays from noon to 5 p.m. since November. Founder Linda Plazonja said the market sessions will have a different lineup of offerings, with 11 vendors on Sundays and eight signed up for Mondays. Among the vendors for the new Monday markets are Enterprise Farms, Vianne Chocolates, and Q’s Nuts. The winter market is scheduled to operate in the Arcade Building until June.