refactored gradle project structure

spring-data/spring-data-rest-associations/README.md

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+# Handling associations between entities with Spring Data Rest
+ 
+This repo contains some example code that exposes some Spring Data repositories
+via Spring Data REST to show how to handle relationships between JPA entities
+via the REST API.
+
+## Companion Blog Post
+
+The companion blog post with more details can be found [here](https://reflectoring.io/relations-with-spring-data-rest/).
+
+## Running the application
+
+Simply run `gradlew bootrun` on Windows or `./gradlew.sh bootrun` on Unix.