Add submission # 6581

#6581

Author: ArduinoBot

registry.txt

@@ -8200,3 +8200,4 @@ https://github.com/kkfranco98/FIR_Filters.git|Contributed|FIR_Filters
 https://github.com/AbdulKus/72x40oled_lib.git|Contributed|72x40oled_lib
 https://github.com/m-shintaro/SpresenseIMU.git|Contributed|SpresenseIMU
 https://github.com/X-croot/UltraSonicXCR.git|Contributed|UltraSonicXCR
+https://github.com/msnicklous/CommandCatcher.git|Contributed|CommandCatcher