Add badges and a link to the corresponding paper.

Author: fjankowsk

README.md

@@ -1,14 +1,22 @@
 # skymap: Create and visualise sky map data #
 
+[![GitHub issues](https://img.shields.io/badge/issue_tracking-GitHub-blue.svg)](https://github.com/fjankowsk/skymap/issues/)
+[![Paper link](https://img.shields.io/badge/paper-10.1093/mnras/stad2041-blue.svg)](https://doi.org/10.1093/mnras/stad2041)
+[![arXiv link](https://img.shields.io/badge/arXiv-2302.10107-blue.svg)](https://arxiv.org/abs/2302.10107)
+
 This repository contains software tools to create and visualise sky map data, primarily in HEALPix format. The code is mainly developed for Python 3, but Python 2 from version 2.7 onwards should work fine.
 
 ## Author ##
 
 The software is primarily developed and maintained by Fabian Jankowski. For more information feel free to contact me via: fabian.jankowski at cnrs-orleans.fr.
 
+## Paper ##
+
+The corresponding paper (Jankowski et al. 2023, MNRAS) is available via this [NASA ADS link](https://ui.adsabs.harvard.edu/abs/2023MNRAS.524.4275J/abstract).
+
 ## Citation ##
 
-If you make use of the software, please add a link to this repository and cite our upcoming paper. See the CITATION file.
+If you make use of the software, please add a link to this repository and cite our corresponding paper. See above and the CITATION and CITATION.bib files.
 
 ## Installation ##