Update README.md

Author: ArtifactForms

README.md

@@ -1,6 +1,7 @@
 <a href="https://codeclimate.com/github/ArtifactForms/MeshLibCore/maintainability"><img src="https://api.codeclimate.com/v1/badges/c860a89479fdedd6be77/maintainability" /></a>
 [![Codacy Badge](https://app.codacy.com/project/badge/Grade/5d913b2c5d064bee83780eefee17f400)](https://app.codacy.com/gh/ArtifactForms/MeshLibCore/dashboard?utm_source=gh&utm_medium=referral&utm_content=&utm_campaign=Badge_grade)
 [![Java CI with Maven](https://github.com/ArtifactForms/MeshLibCore/actions/workflows/maven.yml/badge.svg)](https://github.com/ArtifactForms/MeshLibCore/actions/workflows/maven.yml)
+[![.github/workflows/unit-tests.yml](https://github.com/ArtifactForms/MeshLibCore/actions/workflows/unit-tests.yml/badge.svg)](https://github.com/ArtifactForms/MeshLibCore/actions/workflows/unit-tests.yml)
 
 # Artifact Forms
 A *JAVA* library to construct and manipulate geometry in Three-dimensional space.