if ($ver.Version.Major -gt 1) {$host.Runspace.ThreadOptions = "ReuseThread"}
if ((Get-PSSnapin "Microsoft.SharePoint.PowerShell" -ErrorAction SilentlyContinue) -eq $null)
{
    Add-PSSnapin "Microsoft.SharePoint.PowerShell"
}


Function UploadListTemplate($WebURL, $TemplateFilePath)
{
    #Get the Web
    $web = Get-SPWeb $WebURL

    #Get the List template Gallery Folder
    $TemplateFolder = $web.GetFolder("List Template Gallery")

    #Get the Files collection
    $TemplateFileCollection = $TemplateFolder.Files

    #Get the Template file from Local File system
    $TemplateFile = Get-ChildItem $TemplateFilePath

    #Open the File in Read mode and Add to Templates collection
    $TemplateFileCollection.Add("_catalogs/lt/$($TemplateFile.Name)"
    $TemplateFile.OpenRead(), $true)
    Write-Host "Done!Template has been uploaded!!"
}

#Call the function
UploadListTemplate "http://sharepoint.crescent.com" "D:TemplatesCustomTaskList.stp"

function UploadAndCreate-CustomListTemplate()
{
param(
    [Parameter(Mandatory=$true)][string]$rooturl,
    [Parameter(Mandatory=$true)][string]$listCreationUrl,
    [Parameter(Mandatory=$false)][System.Net.NetworkCredential]$credentials,
    [Parameter(Mandatory=$true)][string]$listName,
    [Parameter(Mandatory=$true)][string]$listTemplateFileUrl,
    [Parameter(Mandatory=$true)][string]$listTemplateName

)

    try
    {
        # Adding the PowerShell Snapin
        Add-PSSnapin “Microsoft.SharePoint.PowerShell”

        # Get the SiteURL
        $site = get-spsite($rooturl)

        # Get the root web
        $web = $site.RootWeb

        # Get the list template gallery
        $spLTG = $web.getfolder(“List Template Gallery”)

        # Get the list template gallery Collection
        $spcollection = $spLTG.files

        # Get the custom list template file
        $Templatefile = get-item $listTemplateFileUrl

        # Add the custom list template file to gallery
        $titleHashTbl = @{}
        $titleHashTbl.Add("Title", $listTemplateName)
        $folderListTemplate = "_catalogs/lt/" + $listTemplateName + ".stp"
        $spcollection.Add($folderListTemplate,   $Templatefile.OpenRead(),$titleHashTbl,$true)
        Write-Host “Custom Template Uploaded to List Template Gallery Successfully”

        Write-Host “Creating the List based on the Template”
        # Get the custom list templates
        $CustomlistTemplates = $site.GetCustomListTemplates($web)

        #Create the custom list using template
        $site = Get-SPWeb $listCreationUrl
        $site.Lists.Add($listName, $listName, $CustomlistTemplates[$listTemplateName])
        Write-Host "Based on the template List Created"
    }
    catch
    {
        Write-Host ("Error while creating list. Error -->> " + $_.Exception.Message) -ForegroundColor Red
    }

}

$rootUrl = "http://somesite.com"
$url = "http://somesite.com" #Or http://somesite.com/subsite
$credentials = Get-Credential
$listName = "Some List"
$listTemplateFileUrl = "d:whatever"
$listTemplateName = "List Template Name"


UploadAndCreate-CustomListTemplate $rootUrl $url $credentials $listName $listTemplateFileUrl $listTemplateName