Bitcoin Core App Design Jam Session #2: Create wallet & send flows

Our second jam sessions purely around the design of the new Bitcoin Core App. We discussed the screens, states & flows involved in wallet creation and sending bitcoin. It's all pretty rough at the moment and we will try to refine these experiences better as our next steps.

Issue:
https://github.com/BitcoinDesign/Meta/issues/358

Design documentation:
https://bitcoincore.app/