JAVA-15787 Created new messaging-modules and saas-modules

- Moved jgroups, rabbitmq, spring-amqp, spring-apache-camel, spring-jms to messaging-modules
- Moved twilio, twitter4j, strip to saas-modules
- Renamed existing saas to jira-rest-integration

messaging-modules/spring-apache-camel/README.md

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+## Spring Apache Camel
+
+This module contains articles about Spring with Apache Camel
+
+### Relevant Articles
+
+- [Apache Camel](http://camel.apache.org/)
+- [Enterprise Integration Patterns](http://www.enterpriseintegrationpatterns.com/patterns/messaging/toc.html)
+- [Introduction To Apache Camel](http://www.baeldung.com/apache-camel-intro)
+- [Integration Patterns With Apache Camel](http://www.baeldung.com/camel-integration-patterns)
+- [Using Apache Camel with Spring](http://www.baeldung.com/spring-apache-camel-tutorial)
+- [Unmarshalling a JSON Array Using camel-jackson](https://www.baeldung.com/java-camel-jackson-json-array)
+
+### Framework Versions:
+
+- Spring 4.2.4
+- Apache Camel 2.16.1
+
+### Build and Run Application
+
+To build this application execute:
+
+`mvn clean install`
+
+To run this application you can either run our main class App from your IDE or you can execute following maven command:
+
+`mvn exec:java -Dexec.mainClass="com.baeldung.camel.main.App"`