Update README.rdoc
Update README.rdoc

Fix some typo about database name.
add number to each step
nattee/cafe-grader-web,nattee/cafe-grader-web,nattee/cafe-grader-web,cafe-grader-team/cafe-grader-web,jittat/cafe-grader-web,nattee/cafe-grader-web,cafe-grader-team/cafe-grader-web,cafe-grader-team/cafe-grader-web,cafe-grader-team/cafe-grader-web,jittat/cafe-grader-web