How to add users in .txt file to SharePoint Groups In using PowerShell?

Power Shell

• Powershell
• CSOM

# Adding the PowerShell Snapin
Add-PSSnapin "Microsoft.SharePoint.PowerShell"
# Get the SiteURL
$webUrl = "http://mysite/"
$web = Get-SPWeb $webUrl
$fileWithPath = "D:\user.txt"
$content = Get-Content $fileWithPath
$spGroup = "Security Read"
$rd="Read"



foreach($user in $content)
{    
    try
    {
        $spUser = $web.EnsureUser($user)
        if($spUser -ne $null)
        {
        Write-Host $spuser
            Write-Host "Adding " $spUser
            $web.SiteGroups[$spGroup].AddUser($spUser)
            Write-Host $user  " User added to the
 group successfully" -foregroundcolor Green
        }
        else
        {
        Write-Host $spUser " does not exists"
    }
    }
    catch
    {
        Write-Host "Error occured on " $user -foregroundcolor Red
    } 
}