Update repositories.txt (#3630)

Author: boeserfrosch

repositories.txt

@@ -6418,6 +6418,7 @@ https://github.com/jmparatte/jm_crc-ccitt
 https://github.com/hpsaturn/espnow-joystick
 https://github.com/koendv/FloatToString
 https://github.com/boeserfrosch/GuL_Plantower
+https://github.com/boeserfrosch/GuL_NovaFitness
 https://github.com/Zeppelin500/MBusinoLib
 https://github.com/m5stack/M5Unit-ToF4M
 https://github.com/MOMIZICH/Shift_Register_Controller