ANASTASIA MOLONEY and NITA BHALLA  U.S. President-elect Joe Biden has pledged to appoint a diverse cabinet that "looks like America," promising to bring more women into the top echelons of government. The incoming Democrat has named Avril Haines to be director of national intelligence and Janet Yellen as secretary of the Department of Treasury - both would be the first women to hold those positions. Biden's promise of a more gender-balanced cabinet follows examples set in several countries spanning the globe. Here are seven countries already leading the way: RWANDA The small East African nation of Rwanda boasts by far…