adding kafka plugin for auto-completion

plugins/kafka/README.md

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+# Kafka ZSH completion 
+This projects aims at developing Kafka completion scripts. The scripts may be contributed to another project when stable enough.
+
+## Usage
+
+To start using the Kafka autocompletion just download the repository locally and `source kafka.zsh` 
+
+## Supported completion
+
+- kafka-topics
+- kafka-acls
+- kafka-configs
+- kafka-console-producer
+- kafka-console-consumer
+- kafka-consumer-perf-test
+- kafka-producer-perf-test
+- kafka-avro-console-consumer
+- kafka-avro-console-producer
+- kafka-broker-api-versions
+- kafka-consumer-groups
+- kafka-delegation-tokens
+- kafka-dump-log
+- kafka-log-dirs
+- kafka-verifiable-consumer
+- kafka-verifiable-producer
+- kafka-streams-application-reset
+- kafka-mirror-maker
+- kafka-delete-records
+- replicator
+
+## Notes
+
+- The source of information used for the completion is gathered from the usage of the CLI tool. 
+- This script relies on Apache Kafka Confluent distribution (either Open Source or Enterprise)
+- To avoid reloading and parsing all the information and each shell, a first script `generate.zsh` is actually gathering all the information on the local machine and generating the `kafka.zsh` auto-completion file with hardcoded information. 
+
+## Examples
+
+[![asciicast](https://asciinema.org/a/TenI5dsznpLp8XM4HTsjiJYGA.png)](https://asciinema.org/a/TenI5dsznpLp8XM4HTsjiJYGA)