Update readme.md

Author: jovanpop-msft

samples/manage/synapse-analytics/storage/readme.md

@@ -9,6 +9,9 @@ This template deploys configured Azure Storage account for Synapse workspace.
 <img src="https://raw.githubusercontent.com/Azure/azure-quickstart-templates/master/1-CONTRIBUTION-GUIDE/images/visualizebutton.png"/>
 </a>
 
+Select subscription, create resorce group (or use existing one), and put storage account name:
+![Deploy storage](media/create-synapse-storage-template.png)
+
 When you create storage, use [this link](https://portal.azure.com/?feature.customportal=false&feature.canmodifystamps=true&SqlAzureExtension=synapse&microsoft_azure_synapse_assettypeoptions=%7B%22SynapseWorkspace%22%3A%7B%22options%22%3A%22%22%7D%2C%22SparkPool%22%3A%7B%22options%22%3A%22hideassettype%22%7D%7D&microsoft_azure_marketplace_ItemHideKey=SynapseExtensionPreview#blade/Microsoft_Azure_Marketplace/MarketplaceOffersBlade/selectedMenuItemId/home/searchQuery/Azure%2BSynapse%2BAnalytics%2B(preview)
 ) to create Azure Synapse Analytics workspace **(not former DataWarehouse)** and assign the Azure Storage account created with this template.