Add five Medium articles

Author: Ivan Franchin

README.adoc

@@ -9,6 +9,11 @@ On https://ivangfr.github.io:[ivangfr.github.io], I have compiled my Proof-of-Co
 == Additional Readings
 
 * [Medium]: https://medium.com/@ivangfr/building-a-web-chat-with-social-login-using-spring-boot-introduction-644702e6be8e[**Building a Web Chat with Social Login using Spring Boot: Introduction**]
+* [Medium]: https://medium.com/javarevisited/implementing-a-kafka-producer-and-consumer-using-spring-cloud-stream-d4b9a6a9eab1[**Implementing a Kafka Producer and Consumer using Spring Cloud Stream**]
+* [Medium]: https://medium.com/javarevisited/implementing-unit-tests-for-a-kafka-producer-and-consumer-that-uses-spring-cloud-stream-f7a98a89fcf2[**Implementing Unit Tests for a Kafka Producer and Consumer that uses Spring Cloud Stream**]
+* [Medium]: https://medium.com/javarevisited/implementing-end-to-end-testing-for-a-kafka-producer-and-consumer-that-uses-spring-cloud-stream-fbf5e666899e[**Implementing End-to-End testing for a Kafka Producer and Consumer that uses Spring Cloud Stream**]
+* [Medium]: https://medium.com/javarevisited/configuring-distributed-tracing-with-zipkin-in-a-kafka-producer-and-consumer-that-uses-spring-cloud-9f1e55468b9e[**Configuring Distributed Tracing with Zipkin in a Kafka Producer and Consumer that uses Spring Cloud Stream**]
+* [Medium]: https://medium.com/@ivangfr/using-cloudevents-in-a-kafka-producer-and-consumer-that-uses-spring-cloud-stream-9c51670b5566[**Using Cloudevents in a Kafka Producer and Consumer that uses Spring Cloud Stream**]
 
 == Project Diagram