Update README.md

Author: phpclub

README.md

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 # Kohana.World Docker Images ( kohana.world, koseven, modseven)
 ![License](https://img.shields.io/badge/license-BSD--3--Clause-green.svg)
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+[![GitHub Actions Demo](https://github.com/kohana-world/docker/actions/workflows/github-actions-demo.yml/badge.svg)](https://github.com/kohana-world/docker/actions/workflows/github-actions-demo.yml)
 This repository holds docker images which can be used for Kohana Framework.
 
 There will be 4 branches which all server a different purpose: