Added readme.

Author: odrotbohm

readme.md

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+# Spring Data JPA Examples
+
+This repository contains a variety of sample projects showing Spring Data JPA functionality.
+
+* `spring-data-jpa-example` - probably the project you want to have a look at first. Contains a variety of sample packages, showcasing the different levels at which you can use Spring Data JPA. Have a look at the `simple` package for the most basic setup.
+* `java8-auditing` - example of how to use Spring Data JPA auditing with Java 8 date time types.
+* `spring-data-jpa-showcase` - refactoring show case of how to improve a plain-JPA-based persistence layer by using Spring Data JPA (read: removing close to all of the implementation code). Follow the `demo.txt` file for detailed instructions.
+* `spring-data-jpa-interceptors` - Example of how to enrich the repositories with AOP.