Add simple HOWTO instructions and module load script for Cori GPU

HOWTO

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+1. Load necessary modules
+sh ./load_cgpu_modules.sh 
+
+2. run bootstrap scrip
+./bootstrap.sh
+
+3. run configure script
+sh config-command
+
+4. compile 
+make -j8

load_cgpu_modules.sh

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+#!/bin/sh -f
+
+module load cgpu 
+module load gcc/8.3.0
+module load cuda/11.0.3
+module load llvm/14.0.0-git_20211104b