[new] add system requirements to play2scala tutorial
[new] add system requirements to play2scala tutorial

auth0/docs,khorne3/docs,Annyv2/docs,khorne3/docs,Catografix/docs,auth0/docs,jeffreylees/docs,sandrinodimattia/docs,sandrinodimattia/docs,sandrinodimattia/docs,khorne3/docs,yvonnewilson/docs,hamzawi06/docs,jeffreylees/docs,Catografix/docs,auth0/docs,Catografix/docs,Annyv2/docs,Annyv2/docs,yvonnewilson/docs,jeffreylees/docs,hamzawi06/docs,yvonnewilson/docs,hamzawi06/docs