Add submission # 4215

#4215

Author: ArduinoBot

registry.txt

@@ -6875,3 +6875,4 @@ https://github.com/bonezegei/Bonezegei_Printf.git|Contributed|Bonezegei_Printf
 https://github.com/Erqos/EQSP32.git|Contributed|EQSP32
 https://github.com/I-AM-ENGINEER/MT6701-arduino.git|Contributed|MT6701-arduino
 https://github.com/yuuu/M5StampC3LED.git|Contributed|M5StampC3LED
+https://github.com/okalachev/flixperiph.git|Contributed|FlixPeriph