README.adoc addition

Author: jponge

junit5-examples/README.adoc

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+= Vert.x JUnit 5 examples
+
+This project illustrates how to use JUnit 5 with Vert.x for testing asynchronous operations.
+
+link:pom.xml[pom.xml] declares the dependencies and configures the Maven Surefire plugin.
+Gradle users should check the documentation at http://junit.org/junit5/docs/current/user-guide/#running-tests-build-gradle
+
+The link:src/test/java/hello/SampleVerticleTest.java[SampleVerticleTest.java] file contains a few test cases
+of how to deal with asynchronous events (timers, deployments, network requests, etc).