remove SA/ folder, modify README (add gnuplot.cmd's explanation.
use awk to modify cpuusage to let gnuplot use.
awk '{print NR-600 $1}' > cpuusage_tmp
finish command using by gnuplot
finish drawing the graph using gnuplot
remove the tmp files that will be generated during cpuplot.sh
remove test file cpuusage_tmp
Add System Info Monitor's explaination
add sysmonitor.sh ps_tmp
sysmonitor finish calculate idle size and total size
ps_tmp is a file to record the temp file from ps aux