Add how to cite to README

Author: iimog

README.md

@@ -6,6 +6,10 @@ See this tutorial: https://tbro-tutorial.readthedocs.io/en/latest/
 A public instance of TBro with the Venus Flytrap transcriptome: http://tbro.carnivorom.com/
 ## Host your own instance
 Docker images are available: https://hub.docker.com/u/tbroteam/
+## How to cite
+If you use TBro please cite this publication: [![DOI](https://img.shields.io/badge/DOI-10.1093%2Fdatabase%2Fbaw146-blue.svg)](https://dx.doi.org/10.1093/database/baw146)
+> Ankenbrand MJ, Weber L, Becker D, Förster F, and Bemm F. "TBro: Visualization and Management of de Novo Transcriptomes." Database 2016 (October 18, 2016): baw146. doi:10.1093/database/baw146.
+ 
 ## Changes
 ### 1.1.1 <2016-09-28 Mo>
  - Custom annotations for unigenes