Add archival notice to the README

README.md

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 [![Nextflow](https://img.shields.io/badge/nextflow-%E2%89%A50.27.6-brightgreen.svg)](https://www.nextflow.io/)
 [![Gitter](https://img.shields.io/badge/gitter-%20join%20chat%20%E2%86%92-4fb99a.svg?style=flat-square)](https://gitter.im/SciLifeLab/NGI-RNAseq)
 
+
+# This pipeline has moved!
+
+This pipeline has been moved to the new [nf-core](http://nf-co.re/) project.
+You can now find it here:
+
+### https://github.com/nf-core/rnaseq
+
+If you have any problems with the pipeline, please create an issue at the above repository instead.
+
+To find out more about nf-core, visit [http://nf-co.re/](http://nf-co.re/)
+
+This repository will be archived to maintain the released versions for future reruns, in the spirit of full reproducibility.
+
+If you have any questions, please get in touch: support@ngisweden.se
+
+// [Phil Ewels](http://github.com/ewels/), 2018-08-20
+
+---
+
+
 ### Introduction
 
 NGI-RNAseq is a bioinformatics analysis pipeline used for RNA sequencing data.