Update README.md

Author: wenbinf

README.md

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 # Podcast API Scala Library
 
+[![Scala Run Sample App](https://github.com/ListenNotes/podcast-api-scala/actions/workflows/run-sample-app.yml/badge.svg)](https://github.com/ListenNotes/podcast-api-scala/actions/workflows/run-sample-app.yml)
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 The Podcast API Scala library provides convenient access to the [Listen Notes Podcast API](https://www.listennotes.com/api/) from
 applications written in the Scala language.