Hi @abdullahkhan,
If you are using an ESP-EYE board, that is officially supported by Edge Impulse (https://docs.edgeimpulse.com/docs/development-platforms/officially-supported-mcu-targets/espressif-esp32), and you can use our Arduino library example (esp32_microphone_continuous) as-is to perform keyword spotting.
If you are using a different board, you will need to write your own driver to sample sound from the microphone, buffer it, and send it to the run_classifier() or run_classifier_continuous() functions in the C++ SDK library. Use the esp32_microphone_continuous as a starting point or feel free to reference my examples for the STM32 and Wio Terminal here.