adding readme and images

Author: rodrigomonteiro-gbb

samples/features/azure-arc/dashboard/README.md

@@ -2,7 +2,7 @@
 
 # ARC SQL enable Azure Dashboard
 This code will demonstrates how to deploy the [SQL Server Instances.json] to Azure portal Dashboards (#https://learn.microsoft.com/en-us/azure/azure-portal/azure-portal-dashboards).
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+(./Dashboard.png)
 ### How to Deploy
 
 1. Sign in to **[Azure Portal](#https://portal.azure.com/)**