Update README.rst

added citation (not sure why .. include doesn't work)

README.rst

@@ -35,7 +35,28 @@ The vision is to create a package for finite volume simulation with applications
 * supports 1D, 2D and 3D problems
 * designed for large-scale inversions
 
-.. include:: CITATION.rst
+
+Citing SimPEG:
+--------------
+
+There is a paper about SimPEG!
+
+
+    Cockett, R., Kang, S., Heagy, L. J., Pidlisecky, A., & Oldenburg, D. W. (2015). SimPEG: An open source framework for simulation and gradient based parameter estimation in geophysical applications. Computers & Geosciences.
+
+
+**BibTex:**
+
+.. code::
+
+    @article{cockett2015simpeg,
+      title={SimPEG: An open source framework for simulation and gradient based parameter estimation in geophysical applications},
+      author={Cockett, Rowan and Kang, Seogi and Heagy, Lindsey J and Pidlisecky, Adam and Oldenburg, Douglas W},
+      journal={Computers \& Geosciences},
+      year={2015},
+      publisher={Elsevier}
+    }
+
 
 Website:
 http://simpeg.xyz