Add some install* / uninstall* scripts

Scripts/uninstall-paint-3d.ps1

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+<#
+.SYNOPSIS
+	Uninstalls Paint 3D
+.DESCRIPTION
+	This PowerShell script uninstalls Paint 3D from the local computer.
+.EXAMPLE
+	PS> ./uninstall-paint-3d
+.LINK
+	https://github.com/fleschutz/PowerShell
+.NOTES
+	Author: Markus Fleschutz / License: CC0
+#>
+
+try {
+	"Uninstalling Paint 3D, please wait..."
+
+	& winget uninstall "Paint 3D"
+	if ($lastExitCode -ne "0") { throw "Can't uninstall Paint 3D, is it installed?" }
+
+	"Paint 3D is uninstalled now."
+	exit 0 # success
+} catch {
+	"Sorry: $($Error[0])"
+	exit 1
+}