Add-ComputersToSCCMCollection.ps1

# Site configuration
$SiteCode = "TES" # Site code 
$ProviderMachineName = "Primary.domain.LOCAL" # SMS Provider machine name

# Customizations
$initParams = @{}
#$initParams.Add("Verbose", $true) # Uncomment this line to enable verbose logging
#$initParams.Add("ErrorAction", "Stop") # Uncomment this line to stop the script on any errors

# Import the ConfigurationManager.psd1 module 
if((Get-Module ConfigurationManager) -eq $null) {
    Import-Module "$($ENV:SMS_ADMIN_UI_PATH)\..\ConfigurationManager.psd1" @initParams 
}

# Connect to the site's drive if it is not already present
if((Get-PSDrive -Name $SiteCode -PSProvider CMSite -ErrorAction SilentlyContinue) -eq $null) {
    New-PSDrive -Name $SiteCode -PSProvider CMSite -Root $ProviderMachineName @initParams
}

# Set the current location to be the site code.
Set-Location "$($SiteCode):\" @initParams

$count = 0
$Array = Get-Content "C:\Temp\Collection.txt" 

$array | foreach { 
    $percent = ($count/($Array.Length))*100
    Write-Progress -Activity "adding pcs $count of $($Array.Length)" -PercentComplete $percent
    Add-CMDeviceCollectionDirectMembershipRule -CollectionName "ProvWave2-Devices" -ResourceID (Get-CMDevice -Name $_).ResourceID
    $count++
}