Added write-uppercase.ps1

Scripts/write-uppercase.ps1

@@ -0,0 +1,19 @@
+#!/snap/bin/powershell
+
+# Syntax:       ./write-uppercase.ps1 [<text>]
+# Description:	writes the given text in uppercase letters
+# Author:	Markus Fleschutz
+# Source:	github.com/fleschutz/PowerShell
+# License:	CC0
+
+param([String]$Text)
+try {
+	if ($Text -eq "" ) {
+		[String]$Text = read-host "Enter text to write"
+	}
+	write-output $Text.ToUpper()
+	exit 0
+} catch {
+	write-error "ERROR in line $($_.InvocationInfo.ScriptLineNumber): $($Error[0])"
+	exit 1
+}