docs: added settings user guides (#2586)

docs/content/user-guide/settings/currencies.md

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+---
+sidebar_position: 2
+---
+
+# Manage Currencies
+
+In this document, you’ll learn how to set the default currency in your store and how to support more currencies.
+
+## Overview
+
+Medusa supports using more than one currency in your store. When you add currencies, you can set prices for products for each of those currencies.
+
+To make a currency available for your customers, you have to use the currency in a region. Then, your customers will be able to choose the region with the currency that fits them.
+
+:::tip
+
+Before you can use a currency in a region, make sure to [add it to your store](#add-a-currency).
+
+:::
+
+---
+
+## Add a Currency
+
+To make a currency available in your store:
+
+1. Go to Settings → Currencies.
+2. Click on the “Edit currencies” button in the Store Currencies section.
+3. In the new window that opens:
+    1. Click on the Add Currencies button.
+    2. Select all the currencies you want to add.
+4. Click on the “Save and close” button.
+
+---
+
+## Set Default Currency
+
+:::tip
+
+Before you can make a currency the default currency, make sure to [add it to your store](#add-a-currency).
+
+:::
+
+To set the default currency of your store:
+
+1. Go to Settings → Currencies.
+2. In the "Default store currency” section, choose from the dropdown the currency you want to make the default.
+
+---
+
+## Remove Currencies
+
+To remove a currency from your store:
+
+1. Go to Settings → Currencies.
+2. Click on the “Edit currencies” button in the Store Currencies section.
+3. In the new window that opens:
+    1. Select all the currencies you want to remove.
+    2. Click on the Remove button.