add overall contest readme
add overall contest readme

seanhess/contests,instructure/contests,stringham/contests,cgmckeever/contests,seanhess/contests,ccmachone/contests,psok/contests,cgmckeever/contests,cgmckeever/contests,ccmachone/contests,vingkan/MebiPenny2012Finals,vingkan/MebiPenny2012Finals,stringham/contests,ccmachone/contests,psok/contests,stringham/contests,vingkan/MebiPenny2012Finals,cgmckeever/contests,instructure/contests,stringham/contests,vingkan/MebiPenny2012Finals,psok/contests,seanhess/contests,ccmachone/contests,stringham/contests,psok/contests,ccmachone/contests,stringham/contests,cgmckeever/contests,seanhess/contests,cgmckeever/contests,instructure/contests,instructure/contests,instructure/contests,instructure/contests