add sd/README.md

2026-08-12 19:03:42 +00:00 · 2024-01-23 20:21:27 -03:00
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 ## `sd` package
 File map:
 * `blockdevice.go`: Contains logic for creating an `io.WriterAt` and `io.ReaderAt` with the `sd.BlockDevice` concrete type
     from the `sd.Card` interface which is intrinsically a blocked reader and writer. 
 * `spicard.go`: Contains the `sd.SpiCard` driver for controlling an SD card over SPI using the most commonly available circuit boards. 
 * `responses.go`: Contains a currently unused SD response implementations as per the latest specification.
 * `definitions.go`: Contains SD Card specification definitions such as the CSD and CID types as well as encoding/decoding logic, as well as CRC logic.