Kurt Eckhardt 7d6e395377 First pass - Teensy 4 Async transfer support Still testing and running into memory usage issues, but I think some of the basics are working. Still need to do more testing, including verifying on larger buffers.		5 lat temu
examples	Example setup code bug	7 lat temu
README.md	Update readme	10 lat temu
SPI.cpp	First pass - Teensy 4 Async transfer support	5 lat temu
SPI.h	First pass - Teensy 4 Async transfer support	5 lat temu
keywords.txt	Add SPI Buffer functions	7 lat temu
library.properties	Add library.properties	8 lat temu

SPI Library for Teensy