inform user of password has requirements (6 char, one number) in prompt

a very simple change in the prompt when asking the user to register a new account: tell ahead of time that the password must include a character (besides the mentioned being six char long).

it is frustrating and confusing to have your input rejected and be forced to start afresh for missing a condition which you were not told.
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aside: i think asking for a number (or any combination of such things as capitals, etc. etc.) is pretty useless. useful are only longer (non dictionary) passwords - and those should only be asked to protect secrets of value.