Update README.md

test/jarvis/jarvis_coeus/jarvis_coeus/lammps/README.md

@@ -1,3 +1,34 @@
 lammps is a molecule dynamic application.
 
-# Installation
+# Install LAMMPS
+use spack to install lammps
+```
+spack install lammps^adios2@2.9.0^mpi
+```
+
+# Download LAMMPS Example scripts
+download the lammps script example
+```
+git clone https://github.com/simongravelle/lammps-input-files.git
+```
+
+# Run the LAMMPS
+choose a example in lammps-input-files, for example, 2D-lennard-jones-fluid.
+In 2D-lennard-jones-fluid folder, run the following command
+```
+lmp -in input.lammps
+```
+# Run the LAMMPS with ADIOS
+In 2D-lennard-jones-fluid folder/input.lammps, change the following code:
+```
+thermo 1000
+dump mydmp all atom 1000 dump.lammpstrj
+run 20000
+```
+to
+```
+thermo 1000
+dump mydmp all atom/adios 1000 dump.lammpstrj
+run 20000
+```
+