Add sidebar to Spring Boot

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+## Related Resources
+
+Spring Boot provides a wide range of support for various services. It's used for most of these guides. This list contains some of them, showing its diverse support.
+
+### Getting Started Guides
+
+* [Building a RESTful Web Service with Spring Boot Actuator][gs-actuator-service]
+* [Accessing Data with JPA][gs-accessing-data-jpa]
+* [Creating Asynchronous Methods][gs-async-method]
+* [Creating a Batch Service][gs-batch-processing]
+* [Securing a Web Application][gs-securing-web]
+* [Uploading a File][gs-uploading-files]
+* [Convert JAR to WAR][gs-convert-jar-to-war]
+
+[gs-actuator-service]: /guides/gs/actuator-service/content
+[gs-accessing-data-jpa]: /guides/gs/accessing-data-jpa/content
+[gs-async-method]: /guides/gs/async-methd/content
+[gs-batch-processing]: /guides/gs/batch-processing/content
+[gs-securing-web]: /guides/gs/securing-web/content
+[gs-uploading-files]: /guides/gs/uploading-files/content
+[gs-convert-jar-to-war]: /guides/gs/converting-jar-to-war/content
+
+### Tutorials
+
+* [Tutorial TBD][tut-tbd]
+
+[tut-tbd]: /guides/tutorials/tbd
+
+### Concepts and Technologies
+
+* [REST][u-rest]
+* [JSON][u-json]
+
+[u-rest]: /understanding/rest
+[u-json]: /understanding/json