feat: add formatCurrency helper

src/lib/helpers/formatCurrency/index.ts

@@ -0,0 +1,7 @@
+export const formatCurrency = (amount: number) => {
+	return new Intl.NumberFormat('pl-PL', {
+		style: 'currency',
+		currency: 'PLN',
+		useGrouping: true
+	}).format(amount);
+};