Update README.md

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@ -8,10 +8,9 @@ Begin by running the Rp2040SdioSetup example to try RP2040/RP2350 SDIO.
This example requires a SDIO Card socket with the following six lines.
CLK - A clock signal sent to the card by the MCU.
CMD - A bidirectional line for for commands and responses.
DAT[0:3] - Four bidirectional lines for data transfer.
* CLK - A clock signal sent to the card by the MCU.
* CMD - A bidirectional line for for commands and responses.
* DAT[0:3] - Four bidirectional lines for data transfer.
CLK and CMD can be connected to any GPIO pins. DAT[0:3] can be connected
to any four consecutive GPIO pins in the order DAT0, DAT1, DAT2, DAT3.