added more instructions on creating mysal data
added more instructions on creating mysal data

nattee/cafe-grader-judge-scripts,nattee/cafe-grader-judge-scripts,jittat/cafe-grader-judge-scripts,nattee/cafe-grader-judge-scripts,jittat/cafe-grader-judge-scripts,nattee/cafe-grader-judge-scripts,jittat/cafe-grader-judge-scripts,jittat/cafe-grader-judge-scripts,nattee/cafe-grader-judge-scripts