Update README.md

Author: kasramp

README.md

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 Spring Kafka example with junit test using EmbeddedKafka.
 
+For the tutorial check the link below,
+
+- [Test Spring Kafka consumer and producer with EmbeddedKafka](https://www.geekyhacker.com/2020/10/03/test-spring-kafka-consumer-and-producer-with-embeddedkafka/)
+
 ## How to run
 
 First start the docker-compose which contains ZooKeeper, Kafka, and Kafdrop.