Add sample instruction on how to test Kafka with ClickHouse locally

dbms/tests/instructions/kafka.txt

@@ -0,0 +1,45 @@
+Use this config for docker-compose:
+
+    version: '3'
+
+    services:
+
+    kafka:
+        depends_on:
+        - zookeeper
+        hostname: kafka
+        image: wurstmeister/kafka
+        environment:
+        KAFKA_LISTENERS: INSIDE://:9092,OUTSIDE://:9094
+        KAFKA_LISTENER_SECURITY_PROTOCOL_MAP: INSIDE:PLAINTEXT,OUTSIDE:PLAINTEXT
+        KAFKA_INTER_BROKER_LISTENER_NAME: INSIDE
+        KAFKA_ZOOKEEPER_CONNECT: zookeeper:2181
+        ports:
+        - "9092:9092"
+        - "9094:9094"
+
+        security_opt:
+        - label:disable
+
+    zookeeper:
+        hostname: zookeeper
+        image: zookeeper
+
+        security_opt:
+        - label:disable
+
+Start containers with `docker-compose up`.
+
+In clickhouse-client create table like:
+
+    CREATE TABLE kafka ( a UInt8,  b String) ENGINE = Kafka('localhost:9092', 'topic', 'group1', 'CSV') SETTINGS kafka_row_delimiter = '\n';
+
+Login inside Kafka container and stream some data:
+
+    docker exec -it <kafka_container_id> bash --login
+    vi data.csv
+    cat data.csv | /opt/kafka/bin/kafka-console-producer.sh --topic topic --broker-list localhost:9092
+    
+Read data in clickhouse:
+
+    SELECT * FROM kafka;