Update readme.md

Yabin Li

2023-12-18 65676c0aaefacff0dfbfb7e1785dda516460d9eb

1
2
3
4
5
6
7
8
9
C    1
CC    2
CCC    3
CD    4
D    5
DC    6
DCC    7
DCCC    8
CM    9