Add credits to Alpakka Kafka and copyright

README.md

@@ -88,5 +88,13 @@ def partitionedStream: ZStream[Clock with Blocking,
 Please feel free to use the [Gitter](https://gitter.im/zio/zio-kafka)
 channel for any and all questions you may have.
 
+## Credits
+
+This library is heavily inspired and made possible by the research and implementation done in [Alpakka Kafka](https://github.com/akka/alpakka-kafka), a library maintained by Lightbend and originally written as Reactive Kafka by SoftwareMill.
+
+## Legal
+
+Copyright 2019 Itamar Ravid and the zio-kafka contributors. All rights reserved.
+
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