Geeksville just added the library.json, everything else is from nhatuan84/esp32-micro-sdcar, Sparkfun and sdfatlib
License: GNU General Public License V3 (Because sdfatlib is licensed this way)
visit IOTSHARING.COM for more info this library is for Arduino, I modified it to adapt with ESP32
Demo 7: How to use Arduino ESP32 to store data to sdcard http://www.iotsharing.com/2017/05/how-to-use-arduino-esp32-to-store-data-to-sdcard.html