Added a fork me banner to the demo page.
Added a fork me banner to the demo page.

ashutosh2k12/ScrollToFixed,tomcatt86/ScrollToFixed,ipman3/ScrollToFixed,anemes/ScrollToFixed,bigspotteddog/ScrollToFixed,AyogoHealth/ScrollToFixed,doclabsoft/ScrollToFixed,nishadmenezes/ScrollToFixed,ztx1491/ScrollToFixed