Script to add users to an AD group - export file with confirmation of what accounts where added.

Hi EE

I want to use the script below to set a task to add users to a group every night . The Users.txt file will be updated
by the application owner .

can someone help me modify it so the script outputs a file of the SamAccountNames that where added ?
something like  export-csv C:\PS\AddedtoXXXgroup_$((Get-Date -Format MM-dd-yyyy)).csv -NoTypeInformation


Foreach ($User in GC \\Server\Share\Users.txt){
GC C:\PS\groups.txt | % {
Add-ADGroupmember -identity $_ -member $User
      }
}