add README.txt
 add README
 change int to long
 change filename
add HOWTO.txt
delete README.txt
 if no argument, print and return.
Merge pull request #8 from Bloodevil/master

reame 생성, int는 long으로
Merge pull request #6 from miura0806/master

add HOWTO.txt
input the value from consol by user when argument isn't