Add submission # 6660

#6660

Author: ArduinoBot

registry.txt

@@ -8270,3 +8270,4 @@ https://github.com/MicrochipTech/RNWF02_WIFI_ARDUINO_LIBRARY.git|Contributed|Mic
 https://github.com/OlivierPcheux/MTobjects.git|Contributed|MTobjects
 https://github.com/GyverLibs/GyverPing.git|Contributed|GyverPing
 https://github.com/dayatkun01/ClearDS1302.git|Contributed|ClearDS1302
+https://github.com/ennio64/CL57R-Stepper-Driver-Arduino-Library.git|Contributed|CL57RStepper