add cp-kafka-mqtt

kafka-mqtt/README.md

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+kafka-mqtt
+==========
+
+Confluent Docker Image for Kafka MQTT Proxy.

kafka-mqtt/docker-compose.yml

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+kafka-mqtt:
+  image: confluentinc/cp-kafka-mqtt
+  ports:
+    - "1883:1883"
+  environment:
+    - KAFKA_MQTT_BOOTSTRAP_SERVERS=kafka1:9092,kafka2:9092,kafka3:9092
+    - KAFKA_MQTT_TOPIC_REGEX_LIST=temperature:.*
+  extra_hosts:
+    - kafka1:10.0.0.21
+    - kafka2:10.0.0.22
+    - kafka3:10.0.0.23
+  restart: unless-stopped