Explain 'placeholder' attribute usage - fixes #5
Explain 'placeholder' attribute usage - fixes #5

zbraniecki/buddyup,zbraniecki/buddyup,JohanLorenzo/buddyup,Rik/buddyup,mozilla/buddyup,adamkalis/buddyup,mozilla/buddyup,mythmon/buddyup,JohanLorenzo/buddyup,mythmon/buddyup,Rik/buddyup,Rik/buddyup,adamkalis/buddyup,adamkalis/buddyup,mythmon/buddyup,JohanLorenzo/buddyup,mozilla/mortar-privileged-remote-app,mozilla/buddyup,zbraniecki/buddyup