Missing library.properties for Arduino IDE

[gitcnd]

Needs this in it:

name=nanopb-arduino
version=2017.1.2
author=Eric Wieser
maintainer=
sentence=Simple layer to convert arduino Streams into nanopb pb_streams
paragraph=
category=Uncategorized
url=https://github.com/eric-wieser/nanopb-arduino
architectures=avr

[dwijtsma]

COBS on top of nanopb was exactly what I planned to do. I use USB Serial so no CRC or checksum needed.
It would be nice if it was available using the Arduino library manager
Great job!