Update README.md

Author: txubelaxu

README.md

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 ESPHome component to monitor a Jikong Battery Management System (JK-BMS) via UART-TTL or BLE
 
+NEW: monitor your new JK-PBx BMSs via internal RS485 network using 1 only ESP.
+Click here https://github.com/txubelaxu/esphome-jk-bms/blob/main/components/jk_rs485_bms/README.md for more info.
+
 ![Lovelace entities card](lovelace-entities-card.png "Lovelace entities card")
 
 ## Supported devices