Add submission # 6566

#6566

Author: ArduinoBot

registry.txt

@@ -8189,3 +8189,4 @@ https://github.com/AntonioPrevitali/ApJSY194T.git|Contributed|ApJSY194T
 https://github.com/ArthZ01/JWT-Lib.git|Contributed|JWTUtils
 https://github.com/ArthZ01/AES-Lib.git|Contributed|AESUtils
 https://github.com/PlayingWithFusion/PWFusion_SHT3X.git|Contributed|PWFusion_SHT3X
+https://github.com/EduKits/ManagedButtons.git|Contributed|ManagedButtons