[SORMAS-Foundation#3730] add status badge

Author: JonasCir

README.md

@@ -7,7 +7,7 @@
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-  <a href="https://github.com/hzi-braunschweig/SORMAS-Project/blob/development/LICENSE"><img alt="License" src="https://img.shields.io/badge/license-GPL%20v3-blue"/></a> <a href="https://github.com/hzi-braunschweig/SORMAS-Project/releases/latest"><img alt="Latest Release" src="https://img.shields.io/github/v/release/hzi-braunschweig/SORMAS-Project"/></a> <img alt="Development Build Status" src="https://travis-ci.com/hzi-braunschweig/SORMAS-Project.svg?branch=development"/> <a href="https://gitter.im/SORMAS-Project"><img alt="Gitter" src="https://badges.gitter.im/SORMAS-Project/dev-support.svg"/></a>
+  <a href="https://github.com/hzi-braunschweig/SORMAS-Project/blob/development/LICENSE"><img alt="License" src="https://img.shields.io/badge/license-GPL%20v3-blue"/></a> <a href="https://github.com/hzi-braunschweig/SORMAS-Project/releases/latest"><img alt="Latest Release" src="https://img.shields.io/github/v/release/hzi-braunschweig/SORMAS-Project"/></a> <img alt="Development Build Status" src="https://github.com/hzi-braunschweig/SORMAS-Project/workflows/Java%20CI%20with%20Maven/badge.svg?branch=development"/> <a href="https://gitter.im/SORMAS-Project"><img alt="Gitter" src="https://badges.gitter.im/SORMAS-Project/dev-support.svg"/></a>
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