Add citing entry to README.rst and doc/faq.rst

README.rst

@@ -126,6 +126,27 @@ Important links
 - Download releases: https://pypi.org/project/giotto-tda/
 - Issue tracker: https://github.com/giotto-ai/giotto-tda/issues
 
+
+Citing giotto-tda
+-----------------
+
+If you use ``giotto-tda`` in a scientific publication, we would appreciate citations to the following paper:
+
+   `giotto-tda: A Topological Data Analysis Toolkit for Machine Learning and Data Exploration <https://arxiv.org/abs/2004.02551>`_, Tauzin *et al*, arXiv:2004.02551, 2020.
+
+You can use the following BibTeX entry:
+
+.. code:: RST
+
+    @misc{tauzin2020giottotda,
+          title={giotto-tda: A Topological Data Analysis Toolkit for Machine Learning and Data Exploration},
+          author={Guillaume Tauzin and Umberto Lupo and Lewis Tunstall and Julian Burella Pérez and Matteo Caorsi and Anibal Medina-Mardones and Alberto Dassatti and Kathryn Hess},
+          year={2020},
+          eprint={2004.02551},
+          archivePrefix={arXiv},
+          primaryClass={cs.LG}
+    }
+
 Community
 =========
 

doc/faq.rst

@@ -10,6 +10,25 @@ I am a researcher. Can I use ``giotto-tda`` in my project?
 Of course! The `license <https://github.com/giotto-ai/giotto-tda/blob/master/LICENSE>`_ is very permissive.
 For more information, please contact the `L2F team`_.
 
+How do I cite ``giotto-tda``?
+-----------------------------
+We would appreciate citations to the following paper:
+
+   `giotto-tda: A Topological Data Analysis Toolkit for Machine Learning and Data Exploration <https://arxiv.org/abs/2004.02551>`_, Tauzin *et al*, arXiv:2004.02551, 2020.
+
+You can use the following BibTeX entry:
+
+.. code:: RST
+
+    @misc{tauzin2020giottotda,
+          title={giotto-tda: A Topological Data Analysis Toolkit for Machine Learning and Data Exploration},
+          author={Guillaume Tauzin and Umberto Lupo and Lewis Tunstall and Julian Burella Pérez and Matteo Caorsi and Anibal Medina-Mardones and Alberto Dassatti and Kathryn Hess},
+          year={2020},
+          eprint={2004.02551},
+          archivePrefix={arXiv},
+          primaryClass={cs.LG}
+    }
+
 I cannot install ``giotto-tda``
 -------------------------------
 
@@ -26,4 +45,4 @@ There are many TDA libraries available. How is ``giotto-tda`` different?
 ``giotto-tda`` is oriented towards machine learning (for details, see the :ref:`guiding principles <guiding_principles>`).
 This philosophy is in contrast with other reference libraries, like `GUDHI <https://gudhi.inria.fr/doc/latest/index.html>`_,
 which provide more low-level functionality at the expense of being less adapted to e.g. batch processing, or of
-being tightly integrated with ``scikit-learn``.
+being tightly integrated with ``scikit-learn``.