(community association’s appeal from decision granting dairy and creamery a permit for farm market or farm stand as defined under county ordinance; preservation board holding easement over property approved plans for building; zoning commission granted special exemption; board of appeals approved granting of exemption and district court affirmed board’s opinion; on appeal association argued dairy products not permitted to be sold at farm market and market would create negative impacts to rural community; appellate court affirmed board’s opinion holding county ordinance specifically permits sale of dairy products at farm markets; approved use is not a “commercial use” prohibited under state law; and no evidence presented of any negative impacts of proposed market).