Mayor-elect Martin J. Walsh has announced top members of his transition team.The team will include three former mayoral candidates; John Barros, former school committee member; Charlotte Golar Richie, a former Menino aid and state representative in Dorchester; and Felix Arroyo, former city councilor-at-large.The team will also include Joyce Linehan, the policy director for his mayoral campaign and founder of Ashmont media; Katherine Craven of the University of Massachusetts Building Authority; and Sam Tyler of the Boston Municipal Research Bureau.