Add to XML (Powershell)

Hey

XML-file:

<Corp>
      <employee id="123">
             <name>John</name>
             <status>1</status>
       </employee> 
</Corp>		

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Powershell:

$myfile = [xml] (Get-Content ("C:\Users\mic\Desktop\doc.xml") -Encoding UTF8)
$employees = $myfile.SelectNodes("//employee")

foreach($employee in $employees)
{
    $employee.id
    $employee.name
}

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How do I add:  (in the powershell part)

      <employee id="123">
            <name>John</name>
            <status>1</status>
               <salary>10000</salary> ?
      </employee>