PowerShell: Make Changes to CSV for Import Into ADLS Instance

We have an Active Directory Lightweight Directory Services (ADLS) instance that houses users for a custom application.  When new users need to be added to the instance we get a spreadsheet with the user’s names and their usernames.  I needed to figure out a way to import this .CSV, add columns with the appropriate information for import into the ADLS instance.

This is what I came up with.  If there is a “better” or more compact way to do this please feel free to let me know how to do so in the comments.  This is one of the first PowerShell scripts I have ever written and I have a lot to learn.