Add submission # 6691

#6691

Author: ArduinoBot

registry.txt

@@ -8288,3 +8288,4 @@ https://github.com/AvantMaker/ESP32_AI_Connect.git|Contributed|ESP32_AI_Connect
 https://github.com/Jodeenio/74HC595Plus.git|Contributed|74HC595Plus
 https://github.com/sstaub/ST7565DOG.git|Contributed|ST7565DOG
 https://github.com/Nezaemmy/NezaButton.git|Contributed|NezaButton
+https://github.com/wisec/tinysleeper.git|Contributed|TinySleeper