Added comment-based help

Scripts/write-typewriter.ps1

@@ -1,23 +1,23 @@
 #!/snap/bin/powershell
+<#
+.SYNTAX         ./write-typewriter.ps1 [<text>] [<speed>]
+.DESCRIPTION	writes the given text with the typewriter effect
+.LINK		https://github.com/fleschutz/PowerShell
+.NOTES		Author:	Markus Fleschutz / License: CC0
+#>
 
-# Syntax:       ./write-typewriter.ps1 [<text>]
-# Description:	writes the given test with the typewriter effect
-# Author:	Markus Fleschutz
-# Source:	github.com/fleschutz/PowerShell
-# License:	CC0
+param([string]$Text = "", [int]$Speed = 250) # in milliseconds
 
-param([string]$Text)
 if ($Text -eq "" ) {
 	$Text = "`nHello World`n-----------`nPowerShell is cross-platform`nPowerShell is open-source`nPowerShell is easy to learn`nPowerShell is fully documented`n`nThanks for watching`n`n:-)`n`n"
 }
-$Speed = 250 # milliseconds
 
 try {
 	$Random = New-Object System.Random
 
 	$Text -split '' | ForEach-Object {
-		Write-Host -nonewline $_
-		Start-Sleep -milliseconds $(1 + $Random.Next($Speed))
+		write-host -nonewline $_
+		start-sleep -milliseconds $(1 + $Random.Next($Speed))
 	}
 	exit 0
 } catch {