Add some install* / uninstall* scripts

Scripts/install-firefox.ps1

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+<#
+.SYNOPSIS
+	Installs Mozilla Firefox
+.DESCRIPTION
+	This PowerShell script installs Mozilla Firefox from the Microsoft Store.
+.EXAMPLE
+	PS> ./install-firefox
+.LINK
+	https://github.com/fleschutz/PowerShell
+.NOTES
+	Author: Markus Fleschutz | License: CC0
+#>
+
+try {
+	"Installing Firefox, please wait..."
+
+	& winget install "Mozilla Firefox Browser" --source msstore --accept-package-agreements --accept-source-agreements
+	if ($lastExitCode -ne "0") { throw "'winget install' failed" }
+
+	"Firefox installed successfully."
+	exit 0 # success
+} catch {
+	"Sorry: $($Error[0])"
+	exit 1
+}