add flow diagram

Author: vhorne

articles/firewall/choose-firewall-sku.md

@@ -23,6 +23,12 @@ Take a closer look at the features across the three Azure Firewall versions:
 
 :::image type="content" source="media/choose-firewall-sku/azure-firewall-sku-table.png" alt-text="Table of Azure Firewall version features." lightbox="media/choose-firewall-sku/azure-firewall-sku-table-large.png":::
 
+## Flow chart
+
+You can use the following flow chart to help you choose the Azure Firewall version that best fits you needs.
+
+:::image type="content" source="media/choose-firewall-sku/firewall-sku-flow.svg" alt-text="Flow diagram to help you choose a firewall version." lightbox="media/choose-firewall-sku/firewall-sku-flow.svg":::
+
 ## Next steps
 
 - [Deploy and configure Azure Firewall using the Azure portal](tutorial-firewall-deploy-portal.md)