A free financial app and debit card with automated cash rewardsFidelity launched a new banking app geared toward young adults – but available to anyone 18 years or older – to help them build money-saving habits. As part of the launch, they are offering the following signup bonus: Open a Fidelity Bloom Spend account and Save account, and get $50 once you deposit $25 or more within 7 days.Readers also say you’ll get an extra $6 in offers: $1 for linking an account and $5 for checking out their cash back options.The account can only be opened via the mobile app which is currently iOS only, Androi…