added readme and cleaned up ps7 example

Parallel.ps1

@@ -16,16 +16,6 @@ $urls | ForEach-Object -Parallel {
         Write-Host "$($_) could not be reached"
     }
 }
-<#
-$urls | ForEach-Object {
-    $reachable = Test-Connection -ComputerName $_ -Quiet
-    if($reachable){
-        Write-Host "$($_) is reachable"
-    }else {
-        Write-Host "$($_) could not be reached"
-    }
-}
-#>
 
 $end = Get-Date
 $duration = $end - $start