Update repositories.txt (#4214)

Author: yuuu

repositories.txt

@@ -6594,6 +6594,7 @@ https://github.com/YuriiSalimov/YK04_Module
 https://github.com/Yurik72/ESPHap
 https://github.com/yurilopes/SPIFFSIniFile
 https://github.com/YuuichiAkagawa/Arduino-UHS2MIDI
+https://github.com/yuuu/M5StampC3LED
 https://github.com/yyuri/Switch_lib
 https://github.com/Z01NE/MyAlarm
 https://github.com/z3t0/Arduino-IRremote