added badges

Author: simongravelle

.DESCRIPTION.md

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+[![DOI](https://zenodo.org/badge/314814105.svg)](https://zenodo.org/doi/10.5281/zenodo.14747799)
+[![License: CC BY 4.0](https://img.shields.io/badge/License-CC%20BY%204.0-lightgrey.svg)](https://creativecommons.org/licenses/by/4.0/)
+[![PDF](https://img.shields.io/badge/PDF-lammps--tutorials.pdf-red.svg)](lammps-tutorials.pdf)
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 # A Set of Tutorials for the LAMMPS Simulation Package
 
 This article introduces a suite of tutorials designed to make learning LAMMPS

README.md

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+[![DOI](https://zenodo.org/badge/314814105.svg)](https://zenodo.org/doi/10.5281/zenodo.14747799)
+[![License: CC BY 4.0](https://img.shields.io/badge/License-CC%20BY%204.0-lightgrey.svg)](https://creativecommons.org/licenses/by/4.0/)
+[![PDF](https://img.shields.io/badge/PDF-lammps--tutorials.pdf-red.svg)](lammps-tutorials.pdf)
+
 # A Set of Tutorials for the LAMMPS Simulation Package
 
 This article introduces a suite of tutorials designed to make learning LAMMPS