Add license information and figshare DOI to README (#65)

Author: leouieda

README.md

@@ -6,7 +6,10 @@ Agustina Pesce,
 Mario E. Gimenez,
 Leonardo Uieda
 
-This paper has been submitted for publication in the *Geophysical Journal International*.
+This paper has been accepted for publication in *Geophysical Journal International*.
+
+An archived version of this repository is available at 
+[doi.org/10.6084/m9.figshare.8239622](https://doi.org/10.6084/m9.figshare.8239622)
 
 We introduce a novel methodology for gravity forward modeling in spherical coordinates
 using tesseroids (spherical prisms) with variable densities in depth. It builds on
@@ -53,8 +56,7 @@ oscillating density profiles.
 However, the distance-size and delta ratios can be configured by the user to increase
 the accuracy of the results at the expense of computational speed.
 Lastly, we apply this new methodology to model the Neuquén Basin, a foreland basin in
-Argentina with a maximum depth of over 5000m, using an exponential density function.
-
+Argentina with a maximum depth of over 5000 m, using an exponential density function.
 
 ## Reproducing the results
 
@@ -146,6 +148,9 @@ All source code is made available under a BSD 3-clause license.  You can freely
 use and modify the code, without warranty, so long as you provide attribution
 to the authors.  See `LICENSE.md` for the full license text.
 
-The manuscript text is not open source. The authors reserve the rights to the
-article content, which is currently submitted for publication in the
+Data and the results of numerical tests are available under the 
+[Creative Commons Attribution 4.0 License (CC-BY)](https://creativecommons.org/licenses/by/4.0/).
+
+The manuscript text and figures are not open source. The authors reserve the 
+rights to the article content, which has been accepted for publication in
 Geophysical Journal International.