Add submission # 5656

#5656

Author: ArduinoBot

registry.txt

@@ -7736,3 +7736,4 @@ https://github.com/alkonosst/MCP23017.git|Contributed|MCP23017_MR
 https://github.com/Morgritech/MT-arduino-rotary-encoder.git|Contributed|MT-arduino-rotary-encoder
 https://github.com/dndubins/tinyServo84.git|Contributed|tinyServo84
 https://github.com/Seeed-Studio/Seeed_Serial_MP3_Player.git|Contributed|Seeed Serial MP3 Player
+https://github.com/Moarbue/FIR-Filter.git|Contributed|FIR-Filter