Fix the prerequisites

Author: garchiro7

articles/communication-services/quickstarts/voice-video-calling/includes/get-started/get-started-windows.md

@@ -211,6 +211,23 @@ You can make an outbound call by providing a user ID in the text field and click
 
 You can download the sample app from [GitHub](https://github.com/Azure-Samples/communication-services-dotnet-quickstarts/tree/main/CallingWinUI).
 
+### Prerequisites
+
+To complete this tutorial, you need the following prerequisites:
+
+- An Azure account with an active subscription. [Create an account for free](https://azure.microsoft.com/free/?WT.mc_id=A261C142F). 
+- Install [Visual Studio 2022](https://visualstudio.microsoft.com/downloads/) and [Windows App SDK version 1.2 preview 2](https://learn.microsoft.com/windows/apps/windows-app-sdk/preview-channel#version-12-preview-2-120-preview2). 
+- Basic understanding of how to create a WinUI 3 app. [Create your first WinUI 3 (Windows App SDK) project](https://learn.microsoft.com/windows/apps/winui/winui3/create-your-first-winui3-app?pivots=winui3-packaged-csharp) is a good resource to start with.
+- A deployed Communication Services resource. [Create a Communication Services resource](../../../create-communication-resource.md). You need to **record your connection string** for this quickstart.
+- A [User Access Token](../../../identity/access-tokens.md) for your Azure Communication Service. You can also use the Azure CLI and run the command with your connection string to create a user and an access token.
+
+
+  ```azurecli-interactive
+  az communication identity token issue --scope voip --connection-string "yourConnectionString"
+  ```
+
+  For details, see [Use Azure CLI to Create and Manage Access Tokens](../../../identity/access-tokens.md?pivots=platform-azcli).
+
 ### Setting up
 
 #### Creating the project