Update README.md

Updated README. Added reference to Sci Data paper.

README.md

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 [![Build Status](https://travis-ci.org/qresp-code-development/qresp.svg?branch=master)](https://travis-ci.org/qresp-code-development/qresp)
 # Qresp
-[Qresp](http://qresp.org) software repository. 
+Official [Qresp](http://qresp.org) software repository. 
 
 ## About
 **Qresp** "Curation and Exploration of Reproducible Scientific Papers" is a Python application that facilitates the organization, annotation and exploration of data presented in scientific papers.
 
+Reference: 
+
+M. Govoni, M. Munakami, A. Tanikanti, J. H. Skone, H. B. Runesha, F. Giberti, J. de Pablo, and G. Galli, *Qresp, a tool for curating, discovering and exploring reproducible scientific papers*, Sci. Data 6, 190002 (2019). [https://doi.org/10.1038/sdata.2019.2](https://doi.org/10.1038/sdata.2019.2).
+
 ## Documentation
-Qresp documentation is available at [qresp.org](http://qresp.org).
+**Qresp** documentation is available at [qresp.org](http://qresp.org).
 
 ## Development 
-The Qresp development is hosted on [GitHub](https://github.com/west-code-development/qresp), and licensed under the open-source GPLv3 license.
+The **Qresp** development is hosted on [GitHub](https://github.com/west-code-development/qresp), and licensed under the open-source GPLv3 license. See [CONTRIBUTING.md](CONTRIBUTING.md), [CHANGELOG.md](CHANGELOG.md), and [AUTHORS.md](AUTHORS.md) for more information.