docs: added manage customer user guide (#2562)

docs/content/user-guide/customers/manage.mdx

@@ -0,0 +1,37 @@
+---
+sidebar_position: 2
+---
+
+import UiIcon from '@site/src/components/UiIcon';
+
+# Manage Customers
+
+In this document, you’ll learn how to manage customers and their details.
+
+## View Customer Details
+
+To view a customer’s details:
+
+1. Go to the Customers page.
+2. Click on the customer you want to view.
+
+---
+
+## Edit Customer Details
+
+To edit a customer’s details:
+
+1. Go to a Customer’s details page.
+2. Click on the <UiIcon lightIcon="https://i.imgur.com/1ordBC6.png" darkIcon="https://i.imgur.com/dSwWYBH.png" alt="three dots" /> icon in the first section.
+3. Choose Edit from the dropdown.
+4. In the new window that opens, you can edit the customer’s details.
+5. Once you’re done, click on the Save button.
+
+---
+
+## View Customer Orders
+
+To view the orders of a customer:
+
+1. Go to a Customer’s details page.
+2. Scroll to the Orders section. You’ll fine the customer’s orders and you can click on an order to view it.