Update readme.md

Yabin Li

2023-12-18 65676c0aaefacff0dfbfb7e1785dda516460d9eb

1
2
3
4
5
6
7
8
9
10
M    million
MLN    million
m    million
mln    million
B    billion
b    billion
BN    billion
bn    billion
K    thousand
k    thousand