Pre-archive readme update.

README.adoc

@@ -13,6 +13,11 @@
 
 image:https://img.shields.io/maven-central/v/org.neo4j.springframework.data/spring-data-neo4j-rx.svg[Maven Central,link=http://search.maven.org/#search%7Cga%7C1%7Cg%3A%22org.neo4j.springframework.data%22%20AND%20a%3A%22spring-data-neo4j-rx%22]
 
+IMPORTANT: This repository of SDN/RX was set to read-only mode.
+We migrated the project as the successor of the original Spring Data Neo4j to https://github.com/spring-projects/spring-data-neo4j.
+We have moved the issues to the https://jira.spring.io/projects/DATAGRAPH[Spring Jira] where we also will track the new ones.
+
+
 [abstract]
 --
 Spring Data Neo4j⚡️RX - or in short _SDN/RX_ - is an ongoing effort to create the next generation of Spring Data Neo4j, with full reactive support and lightweight mapping.