Update the Contributor guidelines
Update the Contributor guidelines

rajeshpg/playframework,rajeshpg/playframework,wsargent/playframework,marcospereira/playframework,mkurz/playframework,wsargent/playframework,aradchykov/playframework,wegtam/playframework,hagl/playframework,zaneli/playframework,Shenker93/playframework,ktoso/playframework,mkurz/playframework,hagl/playframework,aradchykov/playframework,marcospereira/playframework,zaneli/playframework,mkurz/playframework,richdougherty/playframework,playframework/playframework,playframework/playframework,Shenker93/playframework,Shenker93/playframework,aradchykov/playframework,benmccann/playframework,richdougherty/playframework,Shenker93/playframework,playframework/playframework,wegtam/playframework,Shruti9520/playframework,benmccann/playframework,Shruti9520/playframework,ktoso/playframework,mkurz/playframework,richdougherty/playframework,hagl/playframework,zaneli/playframework,benmccann/playframework,Shruti9520/playframework,richdougherty/playframework,rajeshpg/playframework,wegtam/playframework,zaneli/playframework,marcospereira/playframework,wsargent/playframework,ktoso/playframework,benmccann/playframework,wegtam/playframework,Shruti9520/playframework,ktoso/playframework,rajeshpg/playframework,hagl/playframework,marcospereira/playframework,wsargent/playframework,aradchykov/playframework