Add README

README.md

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+![Logo](https://github.com/openrewrite/rewrite/raw/main/doc/logo-oss.png)
+### Migrate Hibernate ORM. Automatically.
+
+[![ci](https://github.com/openrewrite/rewrite-hibernate/actions/workflows/ci.yml/badge.svg)](https://github.com/openrewrite/rewrite-hibernate/actions/workflows/ci.yml)
+[![Apache 2.0](https://img.shields.io/github/license/openrewrite/rewrite-hibernate.svg)](https://www.apache.org/licenses/LICENSE-2.0)
+[![Maven Central](https://img.shields.io/maven-central/v/org.openrewrite.recipe/rewrite-hibernate.svg)](https://mvnrepository.com/artifact/org.openrewrite.recipe/rewrite-hibernate)
+[![Revved up by Gradle Enterprise](https://img.shields.io/badge/Revved%20up%20by-Gradle%20Enterprise-06A0CE?logo=Gradle&labelColor=02303A)](https://ge.openrewrite.org/scans)
+
+### What is this?
+
+This project implements a [Rewrite module](https://github.com/openrewrite/rewrite) that performs common tasks when migrating to new version of Hibernate ORM.