Update README.md

Author: earlephilhower

README.md

@@ -12,6 +12,8 @@ See https://arduino-pico.readthedocs.io/en/latest/ along with the examples for m
 * Adafruit Feather RP2040
 * Adafruit ItsyBitsy RP2040
 * Adafruit QTPy RP2040
+* Adafruit STEMMA Friend RP2040
+* Adafruit Trinkey RP2040 QT
 * Generic (configurable flash, I/O pins)
 
 # Installing via Arduino Boards Manager