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

pom.xml

@@ -14,7 +14,7 @@
 	<parent>
 		<groupId>org.springframework.boot</groupId>
 		<artifactId>spring-boot-starter-parent</artifactId>
-		<version>2.0.3.RELEASE</version>
+		<version>2.1.0.BUILD-SNAPSHOT</version>
 		<relativePath/> <!-- lookup parent from repository -->
 	</parent>
 
@@ -31,6 +31,7 @@
 		<module>partitioning-samples</module>
 		<module>samples-acceptance-tests</module>
 		<module>cf-acceptance-tests</module>
+    <module>transaction-kafka-samples</module>
 	</modules>
 
 	<properties>