Update README.md

Author: sink772

README.md

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-# javaee-unittest
+[![Maven Central](https://maven-badges.herokuapp.com/maven-central/foundation.icon/javaee-unittest/badge.svg)](https://search.maven.org/search?q=g:foundation.icon%20a:javaee-unittest)
+
+# An Unit Testing Framework for Java SCORE
+
+This repository contains a Java library that can be used to perform the unit testing on your Java SCORE implementation.
+It provides a SCORE execution emulation layer that can be integrated with the JUnit 5 and Mockito frameworks.
+
+## Usage
+
+You can include this package from [Maven Central](https://search.maven.org/search?q=g:foundation.icon%20a:javaee-unittest)
+by adding the following dependency in your `build.gradle`.
+
+```groovy
+implementation 'foundation.icon:javaee-unittest:0.9.0'
+```
+
+For a more complete example, please visit [Java SCORE Examples](https://github.com/icon-project/java-score-examples).
+
+## License
+
+This project is available under the [Apache License, Version 2.0](LICENSE).