added manpage from debian package

doc/lammps.1

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+.TH LAMMPS "2012-02-23"
+.SH NAME
+.B LAMMPS
+\- Molecular Dynamics Simulator.
+
+.SH SYNOPSIS
+.B lammps 
+< in.file
+
+or
+
+mpirun \-np 2 
+.B lammps 
+< in.file
+
+.SH DESCRIPTION
+.B LAMMPS 
+LAMMPS is a classical molecular dynamics code, and an acronym for Large-scale 
+Atomic/Molecular Massively Parallel Simulator. LAMMPS has potentials for soft 
+materials (biomolecules, polymers) and solid-state materials (metals, 
+semiconductors) and coarse-grained or mesoscopic systems. It can be used to 
+model atoms or, more generically, as a parallel particle simulator at the 
+atomic, meso, or continuum scale.
+
+See http://lammps.sandia.gov/ for documentation.
+
+.SH COPYRIGHT 
+© 2003--2012 Sandia Corporation
+
+This package is free software; you can redistribute it and/or modify
+it under the terms of the GNU General Public License as published by
+the Free Software Foundation; either version 2 of the License, or
+(at your option) any later version.
+
+This package is distributed in the hope that it will be useful,
+but WITHOUT ANY WARRANTY; without even the implied warranty of
+MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+GNU General Public License for more details.
+
+On Debian systems, the complete text of the GNU General
+Public License can be found in `/usr/share/common-licenses/GPL-2'.