Create README.md

Author: haeginh

README.md

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+# POLY2TET
+Program described in the jounal paper, "POLY2TET: A Computer Program for Conversion of Computational Human Phantoms from Polygonal Mesh to Tetrahedral Mesh", submitted to Journal of Radiological Protection.
+
+## Installation
+Installation can be done very simply by two lines below.
+```
+cmake .
+make
+```
+## Usage
+```
+./POLY2TET [options] MRCP_AM.obj
+  options:
+  -g : generate Geant4 code
+  -m : generate MCNP6 input file
+  -p : generate PHITS input file
+  -c : positive integer number to replace zero-region number (and not defined regions, when used as -rc)
+  -mat/m : material file in MCNP6 format
+  -mat/p : material file in PHITS format (will be implemented very soon)
+```
+## Monte Carlo dose calculation
+For the Monte Carlo dose calculations, the corresponding code should be installed in the computer.
+### MCNP6 (> version 6 / to use um file: > version 6.2)
+Go to the folder where MCNP6 input file is generated, and then execute MCNP6 with the input file named (phantom_name)_MPNP6.i. 
+```
+MCNP6 n=(phantom_name)_MCNP6.i
+```
+### PHITS (> version 2.88)
+Go to the folder where PHITS input file is generated, and then execute PHITS with the input file named (phantom_name)_PHITS.pin. 
+```
+phits.sh (phantom_name)_PHITS.pin
+```
+### Geant4 (> version 10.0)
+In the folder where Geant4 source code is generated, compile the source code for Geant4 first, and execute the code with the lines below.
+```
+cmake .
+make
+./(phantom_name)
+```