Add some notes on authentication settings to readme.
Add some notes on authentication settings to readme.

Stift/Klondike,themotleyfool/Klondike,jochenvangasse/Klondike,Stift/Klondike,jochenvangasse/Klondike,davidvmckay/Klondike,Stift/Klondike,jochenvangasse/Klondike,davidvmckay/Klondike,davidvmckay/Klondike,themotleyfool/Klondike,fhchina/Klondike,themotleyfool/Klondike,fhchina/Klondike,fhchina/Klondike