Update README.md

Author: Kromian1

README.md

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 # Example app for CI Hexlet course
 
+[![show-directory](https://github.com/Kromian1/hexlet-ci-app/actions/workflows/workflow.yml/badge.svg)](https://github.com/Kromian1/hexlet-ci-app/actions/workflows/workflow.yml)
+
 Starting boilerplate of [Strapi](https://strapi.io/) application
 
 ## System requirements