Kafka Transactional Sample

- Added transactional and some more required properties
 - Setting read_commited in consumer
 - Added license and author tag
 - Added more fleshed out readme
 - Added alternate failure and removed unique index
 - Update spring boot starter parent to 2.1.0.BUILD-SNAPSHOT

transaction-kafka-samples/docker-compose.yml

@@ -0,0 +1,30 @@
+version: '3'
+volumes:
+  data-volume: {}
+services:
+  mysql:
+    image: mariadb
+    ports:
+      - "3306:3306"
+    environment:
+      MYSQL_ROOT_PASSWORD: pwd
+      MYSQL_DATABASE: sample_mysql_db
+    volumes:
+      - data-volume:/var/lib/mysql
+  kafka:
+    image: wurstmeister/kafka
+    container_name: kafka-jdbc-txn-source
+    ports:
+      - "9092:9092"
+    environment:
+      - KAFKA_ADVERTISED_HOST_NAME=127.0.0.1
+      - KAFKA_ADVERTISED_PORT=9092
+      - KAFKA_ZOOKEEPER_CONNECT=zookeeper:2181
+    depends_on:
+      - zookeeper
+  zookeeper:
+    image: wurstmeister/zookeeper
+    ports:
+      - "2181:2181"
+    environment:
+      - KAFKA_ADVERTISED_HOST_NAME=zookeeper