HMMD S3KM1110 with ESP32: Presence & UART Setup

ESP32S Wiki: https://esp32s.com/wiki/hmmd-s3km1110-esp32-presence-sensor/

Arduino-ESP32 3.3.0 compile check; no physical bench test.
Board profile: esp32:esp32:esp32c3:CDCOnBoot=cdc
Libraries: Only Arduino-ESP32 built-in APIs are required for the supplied example.

Read the guide before wiring.
