Added docker files to the user and product microservices to create docker...

Added docker files to the user and product microservices to create docker images. Created docker compose file to pull kafka and zookeeper images from docker. Added the user and product microservices to the docker compose file so they can all be on the same docker network. Modified config files to replace kafka host from localhost to "kafka".

Kafka/docker-compose.yml

+version: "3"
+
+services:
+  zookeeper:
+    image: wurstmeister/zookeeper
+    container_name: zookeeper
+    ports:
+      - "2182:2182"
+    networks:
+      - kafka_network
+
+  kafka:
+    image: wurstmeister/kafka
+    container_name: kafka
+    ports:
+      - "9092:9092"
+    environment:
+      KAFKA_ADVERTISED_HOST_NAME: kafka
+      KAFKA_ZOOKEEPER_CONNECT: zookeeper:2181
+      KAFKA_BOOTSTRAP_SEVERS: kafka:9092
+    networks:
+      - kafka_network
+
+  user-microservice:
+    image: user-microservice:1.0
+    container_name: user-microservice
+    depends_on:
+      - kafka
+      - zookeeper
+    networks:
+      - kafka_network
+
+  product-microservice:
+    image: product-microservice:1.0
+    container_name: product-microservice
+    depends_on:
+      - kafka
+      - zookeeper
+    networks:
+      - kafka_network
+      
+networks:
+  kafka_network:
+    driver: bridge
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