Add submission # 2304

#2304

Author: ArduinoBot

registry.txt

@@ -5570,3 +5570,4 @@ https://github.com/plageoj/request-builder.git|Contributed|RequestBuilder
 https://gitlab.com/softsysco/grove-as3935-lightning-sensor.git|Contributed|Grove_AS3935Lightning_sensor
 https://github.com/Silver-Fang/ArduinoSTL.git|Contributed|STL for Arduino
 https://github.com/Judiviga/ROBLEX.git|Contributed|ROBLEX
+https://github.com/RobTillaart/fast_math.git|Contributed|fast_math