Hello, I have a pandas dataframe with multiple columns and rows. I would like to create an entirely new column to the far left that numbers each row starting from $1.$ How can I do this?$1$ #Confirm dataframe was created

sust$\_$df$.$head$(50)$

Out$[6]$:

FY

Ship

Class

Issue

Task

Problem

Statement

Background

$02022$

CG

Below Waterline

and Tank Top.

Aged and

CG$.22\mathrm{.}1$

None

None

overdue...

$12022$ CG Port Boat Davit

Ao$.$

CG$.22\mathrm{.}4$

None

None

$2,2022$

CG

Superstructure

aged and

overdue

CG$.22\mathrm{.}6$

None

None