Powershell to upload files to SharePoint document library

function UploadFileInLibrary           
{           
    [CmdletBinding()]           
    Param([Parameter(Mandatory=$true,ValueFromPipeline=$true)][string]$webUrl,[Parameter(Mandatory=$true)][string]$ImportLibTitle,[Parameter(Mandatory=$true)][string]$FilePath)               
  
    Start-SPAssignment -Global
    
    #Get handle of PLM CSS web object
    $spSite = Get-SPSite -Identity $webUrl           
    $spWeb = $spSite.OpenWeb()

   try
   {         
     $spWeb.AllowUnsafeUpdates = $true;           

     #Get List handle
     $List = $spWeb.Lists.TryGetList($ImportLibTitle) 
    
     #Get File handle       
     $FileName = $FilePath.Substring($FilePath.LastIndexOf("\")+1)           
     $File= Get-ChildItem $FilePath     
    
     #Read File Stream                           
     $fileStream = ([System.IO.FileInfo] (Get-Item $File.FullName)).OpenRead()
              
     #Add file           
     write-host -NoNewLine -f yellow "Copying file " $File.Name " to " $List.RootFolder.ServerRelativeUrl "..."           
     [Microsoft.SharePoint.SPFile]$spFile = $List.RootFolder.Files.Add($List.RootFolder.Url + "/" + $File.Name, [System.IO.Stream]$fileStream, $true)           
     write-host -f Green "...Success!"
              
     #Close file stream           
     $fileStream.Close()
    
     #Update Item         
     write-host -NoNewLine -f yellow "Added file " $spFile.Name "... to the library "  $ImportLibTitle         
     $spFile.Item.Update() 
    
     #Success         
     write-host -f Green "...Success!"               
   }
   catch
   {
     write-host -f Red "...Failure!"
     $ErrorMessage = $_.Exception.Message
     Write-Host $ErrorMessage -BackgroundColor Red
   } 
   finally
   {
     $spWeb.AllowUnsafeUpdates = $false;
     $spWeb.Dispose()
     $spSite.Dispose()
     Stop-SPAssignment -Global
   }         
}

#Begin Code
cls

asnp "*sh*" #This will add all SnapIns that contain "sh". In most cases, this is just the Microsoft.SharePoint.PowerShell one.

#Read params passed to the powershell
$WebUrl = $args[0] #example: http://*****/sites/YourSite/
$FilePath = $args[1] #example: C:\Users\User\Desktop\FillerFiles\Example.csv
$ImportLibTitle = $args[2] #example: "Title"

#call Import function
UploadFileInLibrary $WebUrl $ImportLibTitle $FilePath