Thalia Pay: Add user-instructions for activating in bankaccounts

Add information about Thalia Pay to bankaccounts

People should know what Thalia Pay is and how to activate it.

Something about that if you sign a direct debit, it will be used for Thalia Pay etc.

Maybe ask the board? Or just come up with something ourselves. It should not be too extensive in my opinion, just something short.

Edited Oct 30, 2019 by Sébastiaan Versteeg

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