add joss paper details

Author: prashjha

README.md

@@ -1,6 +1,6 @@
 # PeriDEM - High-fidelity modeling of granular media consisting of deformable complex-shaped particles
 
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@@ -28,20 +28,25 @@
 ## Introduction
 
 Implementation of the high-fidelity model of granular media that combines the advantages 
-of peridynamics and discrete element method (DEM). 
+of peridynamics and the discrete element method (DEM). 
 The model has the following advantages over existing mechanical models for granular media:
   - handle intra-particle deformation and breakage/damage
-  - handle arbitrary shape of the particle. Inter-particle contact is not specific to any shape of the particle
+  - handle the arbitrary shape of the particle. Inter-particle contact is not specific to any shape of the particle
   - tunable inter-particle contact parameters
   - easy to add different mechanical constitutive laws within peridynamics for individual particle deformation
 
 For more details about the model and results, we refer to the paper:
 
 > Prashant K. Jha, Prathamesh S. Desai, Debdeep Bhattacharya, Robert P Lipton (2020). 
 > **Peridynamics-based discrete element method (PeriDEM) model of granular systems involving breakage of arbitrarily shaped particles**. 
-> *Journal of the Mechanics and Physics of Solids, 151*, p.104376. Doi https://doi.org/10.1016/j.jmps.2021.104376.
-
-Download pdf [here](https://prashjha.github.io/publication/jha-2020-peridem/jha-2020-peridem.pdf).
+> *Journal of the Mechanics and Physics of Solids*, 151, p.104376. Doi https://doi.org/10.1016/j.jmps.2021.104376.
+> Download pdf [here](https://prashjha.github.io/publication/jha-2020-peridem/jha-2020-peridem.pdf).
+
+**PeriDEM is published as a software article in the Journal of Open Source Software:**
+> Prashant K. Jha (2025).
+> **PeriDEM -- High-fidelity modeling of granular media consisting of deformable complex-shaped particles**
+> *Journal of Open Source Software*, vol. 10, 116, p.7525, DOI 10.21105/joss.07525.
+> Download pdf [here](https://doi.org/10.21105/joss.07525).
 
 We have created channels on various platforms: 
 - [PeriDEM on Gitter](https://gitter.im/PeriDEM/community?utm_source=share-link&utm_medium=link&utm_campaign=share-link)