Adding serial numbers as first column to a CSV file

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I have a text file that has a date followed by temperature values. I am converting it to a .csv file with the help of following command:

Import-Csv D:\Arduino\sketch_lm35\11-04-17-LM35.txt -Delimiter "`t" |
    Export-Csv D:\Arduino\sketch_lm35\test.csv -NoTypeInformation

So the generated .csv file will have the date as the first column and temperature as the second column. Now I need to insert a serial number as the first column in the .csv file. How can it be done with PowerShell?

csv powershell
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