Run ESPHome on ESP32-C2 / ESP8684

The marriage of Espressif ESP32-C2 (also known as ESP8684) and ESPHome has arrived.
With a minor limitation of MDNS not functioning and only 2 MB of flash storage, the device is functional enough for basic input, output and sensors.
Here is an example ESPHome configuration YAML file. It is for the ESPC2-01 module with a status LED and HTU21D temperature and humidity sensor connected via I2C.