#4 [harolei] Wrote the test and implement of getting the initial position of the gamer.
#5 [harolei] Wrote the test and implement of setting the gamer to move a random steps between 1 and 6.
#6 [harolei] Wrote the test and implement of displaying the current position of the gamer on the map.
#7 [harolei] Wrote the test and implement of getting the balance of the gamer after buying a land.
#7 [harolei] Wrote the test and implement of getting the balance of the gamer after buying a land and refactor it.
Wrote the main method of the RichMan system.