Adding paper information to the repository

Author: G. H. Erharter

README.md

@@ -7,7 +7,7 @@ by Georg H. Erharter, Franz Tschuchnigg and Gerhard Poscher
 
 published in the __Applied Computing and Geosciences (Vol. XXX; XXX 2021)__
 
-DOI: xxx
+DOI: https://doi.org/10.1016/j.acags.2021.100066
 
 Use the `sediment_generator.py` Python code to generate your own sediment bodies as it is described in the paper.
 

sediment_generator.py

@@ -1,7 +1,10 @@
 # -*- coding: utf-8 -*-
 """
-Source code to the publication "3D Discrete Sediment Body Modelling" by
-G.H. Erharter, F. Tschuchnigg, G. Poscher in the journal XXXXXX
+Source code to the publication
+"Stochastic 3D modelling of discrete sediment bodies for geotechnical applications"
+by G.H. Erharter, F. Tschuchnigg, G. Poscher in the journal
+Applied Computing and Geosciences
+DOI: https://doi.org/10.1016/j.acags.2021.100066
 
 Coding: G.H. Erharter
 """