Ability to Buy TFT and USDC on stellar using the mobile app

[xmonader]

Expand the threefold connect app with market ability to buy TFT and USDC

• Buy TFT on Stellar using the mobile app threefold_connect#775
• Buy USDC using the app threefold_connect#776

[khaledyoussef24]

According to the newly released market section in the app
These parts were mentioned in the issues related but was not implemented yet

• Verify Amount Entry in DGLD
• Buy USDC Using Credit Cards
• Add and Manage Payment Cards

they will be added in threefoldtech/threefold_connect#776
so we shall proceed to verify the current updates