USB driver download:http://www.wch.cn/download/CH341SER_EXE.html
More details please refer to: http://www.espressif.com/en/support/download/documents
Wiki link: http://www.raspberrypiwiki.com/index.php/ESP32-DevKit
low-footprint, minimal system development board which is powered by our latest ESP-WROOM-32 module and can be easily adjusted to a breadboard.
The ESP32-DevKit contains the entire basic support circuitry for the ESP-WROOM-32, including the USB-UART bridge(CH340), reset- and boot-mode buttons, LDO regulator and a micro-USB connector. All pin export GPIO is available to the developer.