docs: added "Customers Overview" documentation (#2083)

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

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+import UiIcon from '@site/src/components/UiIcon';
+
+# Customers Overview
+
+In this document, you’ll get an overview of the customer listing page and all the things you can do with it.
+
+## View List of Customers
+
+You can view the list of available orders in your ecommerce store by clicking on Customers from the sidebar menu.
+
+![Customers List](https://i.imgur.com/VXclXqd.png)
+
+In the list, you can see customer details such as the customer’s name, email address, and the number of orders.
+
+:::tip
+
+If there are more than 15 customers, the list will be split into multiple pages. You can navigate between pages by clicking the arrows at the bottom of the list.
+
+:::
+
+## View List of Customer Groups
+
+Customer groups allow you to put together a set of customers for business purposes. For example, you can create a VIP customer group for customers that you want to give special discounts.
+
+You can view the list of customer groups on the Customer Groups page by clicking on the grey Groups headline next to the Customers headline.
+
+![Customer Groups List](https://i.imgur.com/z1nEvhX.png)
+
+In the list, you can see group details such as the group’s title and the number of customers in the group.
+
+:::tip
+
+If there are more than 15 customer groups, the list will be split into multiple pages. You can navigate between pages by clicking the arrows at the bottom of the list.
+
+:::
+
+## Search Customers
+
+You can search for customers by clicking the <UiIcon lightIcon="https://i.imgur.com/efyG8WQ.png" darkIcon="https://i.imgur.com/NgocLvX.png" alt="magnifier" /> icon at the top right of the customer list. When you search for customers, you search by their first name, last name, and email.
+
+![Search customers by name](https://i.imgur.com/c0IFMej.png)
+
+## Search Customer Groups
+
+You can search for customer groups by clicking the <UiIcon lightIcon="https://i.imgur.com/efyG8WQ.png" darkIcon="https://i.imgur.com/NgocLvX.png" alt="magnifier" /> icon at the top right of the group list. When you search groups, you search by the customer group’s title.
+
+![Search customer groups by title](https://i.imgur.com/aksN5eW.png)
+
+## What More Can you Do with Customers?
+
+The Customers pages in the Medusa Admin include many functionalities including:
+
+- Manage and View a Customer’s Details
+- Manage and View a Customer Group