{team_name: {player_name: points}}. Write a function add_points(board, team, player, points) that adds points to player's score under team, creating the team dict and/or player entry if they do not already exist. Mutate board in place and also return it.board = {'Red': {'Ravi': 10}}; add_points(board, 'Red', 'Ravi', 5); board{'Red': {'Ravi': 15}}Existing player gains 5 more points.
board = {}; add_points(board, 'Blue', 'Sam', 20); board{'Blue': {'Sam': 20}}Both team and player are newly created.
`board.setdefault(team, {})` gets or creates the team's dict.
Then `team_dict[player] = team_dict.get(player, 0) + points`.