Add notes on linux drivers & pins for pinetab #143

docs/software/pinetab.md

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+# Pinetab
+
+These are **preliminary** notes on support for Meshtastic in the Pinetab.
+
+A RF95 is connected via a CS341 USB-SPI chip.
+
+Pin assignments:
+CS0 from RF95 goes to CS0 on CS341
+DIO0 from RF95 goes to INT on CS341
+RST from RF95 goes to RST on CS341
+
+This linux driver claims to provide USB-SPI support: https://github.com/gschorcht/spi-ch341-usb
+Notes here on using that driver: https://www.linuxquestions.org/questions/linux-hardware-18/ch341-usb-to-spi-adaptor-driver-doesn%27t-work-4175622736/
+
+Or if **absolutely** necessary could bitbang: https://www.cnx-software.com/2018/02/16/wch-ch341-usb-to-serial-chip-gets-linux-driver-to-control-gpios-over-usb/