change readme for more detail

zhaomingwork

2023-05-15 c8fe32c5bc0d7ec434d4cbce9f38bd0e1617c93a

1
2
3
4
5
6
7
8
9
x    1
xx    2
xxx    3
xl    4
l    5
lx    6
lxx    7
lxxx    8
xc    9