Wrote up how Blink actually works

Wrote the ReadMe. Three friction points we set out to remove: the signature on every trade, the need to hold a native token for gas, and the menu between you and the position.

ERC-7715 handles the first, Pimlico's paymaster the second, and putting the action on the chart itself handles the third. Blink takes 7.5% per round, which only works if the reduced friction actually brings volume. That is the bet.