Update README.md

Author: erikdeluca

README.md

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-# Stranieri in Italia - Shiny App
-
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 # Stranieri in Italia
 
 Welcome to the **Stranieri in Italia** Shiny Application, designed to
 visualize and analyze ISTAT data on residents in Italy, categorized by
 citizenship and area of residence.
 
+## Access the Application Online
+
+You can access the application online through this link: [Stranieri in Italia - Shiny App](https://erikdeluca.shinyapps.io/Stranieri-in-Italia/)
+
 ## Overview
 
 This application provides interactive insights into the distribution and