Add library.properties

library.properties

+name=SD
+version=1.0.7
+author=Arduino, SparkFun
+maintainer=Paul Stoffregen
+sentence=Enables reading and writing on SD cards. This version is optimized for Teensy.
+paragraph=Once an SD memory card is connected to the SPI interface of the Arduino or Genuino board you can create files and read/write on them. You can also move through directories on the SD card.
+category=Data Storage
+url=http://www.arduino.cc/en/Reference/SD
+architectures=*