Update repositories.txt (#6786)

add M5SwitchC6-ESP-NOW

Author: onexs-xsi

repositories.txt

@@ -4,6 +4,7 @@ https://github.com/Pallob-Gain/packet_device
 https://github.com/gavinlyonsrepo/display16_LTSM
 https://github.com/gavinlyonsrepo/ST7735_LTSM
 https://github.com/anaveo/ParkingSensor
+https://github.com/m5stack/M5SwitchC6-ESP-NOW
 https://github.com/DIYables/arduino-uno-r4-web-server-library
 https://github.com/yosob/SL_simpletask
 https://github.com/DigitalCodesign/MentorBit-RS232