Update readme.md

zhifu gao

2023-06-27 b5f031b8695f54eb33235ce28282d353da035f2b

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