DEVCON-3035
DEVCON-3035

Added robots.txt file for staging branch.
ted-spence-avalara/developer-dot,bob-erdman/developer-dot,bob-erdman/developer-dot,ted-spence-avalara/developer-dot,bob-erdman/developer-dot,bob-erdman/developer-dot,bob-erdman/developer-dot,ted-spence-avalara/developer-dot,ted-spence-avalara/developer-dot,ted-spence-avalara/developer-dot