Update README.md

added code usage of data-showlinenumber and data-showfooter attributes
Create style.css

added sample css style for output
Update example.html

add style sheet
Update README.md

replaced data-showfooter with data-showFooter and data-showlinenumbers with data-showLinenumbers
Update README.md

replaced data-showLinenumbers with data-showLineNumbers
Merge pull request #13 from Jayaramki/master

Update README.md