add M5Unit-KMeterISO (#6174)

* add M5Module-LLM lib

* add M5Atomic-EchoBase lib

* add M5StamPLC Library

* add M5Unit-KMeterISO

Author: Gitshaoxiang

repositories.txt

@@ -4048,6 +4048,7 @@ https://github.com/m5stack/M5Unit-UHF-RFID
 https://github.com/m5stack/M5Unit-QRCode
 https://github.com/m5stack/M5Unit-Synth
 https://github.com/m5stack/M5Unit-BLDC
+https://github.com/m5stack/M5Unit-KMeterISO
 https://github.com/m5stack/M5PoECAM
 https://github.com/m5stack/STAMP-PICO
 https://github.com/m5stack/TimerCam-arduino