Add CI badge

Author: andreas-bauer

README.md

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 # Template for Scout Plugins
 
+[![Plugins](https://github.com/augmented-testing/single-plugin-template/actions/workflows/plugins.yml/badge.svg)](https://github.com/augmented-testing/single-plugin-template/actions/workflows/plugins.yml)
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 ## Introduction
 
 Scout is a tool using a novel approach we call Augmented Testing (AT) to simplify Visual GUI Testing (VGT).