Update README.md

Author: Simply007

README.md

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 # Kentico Cloud sample .NET MVC web application
 [![Build status](https://ci.appveyor.com/api/projects/status/3b9v2fl52v4aiptk/branch/master?svg=true)](https://ci.appveyor.com/project/kentico/cloud-sample-app-net/branch/master)
+[![Stack Overflow](https://img.shields.io/badge/Stack%20Overflow-ASK%20NOW-FE7A16.svg?logo=stackoverflow&logoColor=white)](https://stackoverflow.com/tags/kentico-cloud)
 
 This is a sample website written in ASP.NET MVC 5 that uses the [Kentico Cloud Delivery .NET SDK](https://github.com/Kentico/delivery-sdk-net) to manage and retrieve content from Kentico Cloud. For a brief walkthrough, read [Running the .NET sample app](https://developer.kenticocloud.com/docs/running-net-sample-application) on our Developer Hub.