My first contribution: added name into contributor.html file!

[Emmaka9]

This is my first contribution to any open source project or Github. I'd mean the world to me if this pull request gets accepted. I've modified the contributors.html file and contributors.css file. Personally, I don't work with HTML or CSS. I have followed what others have done in modifying those HTML and CSS files. The change I have made is just added name to the contributors.html file. I'd be happy to receive any feedback. Thanks in advance. Thanks to everyone who has made this possible. @RomchyFCC @DarrenfJ