Add SDS011 library to the Arduino library manager

[ricki-z]

Hello,
I would like to add my library for Arduino library manager. The library is for the SDS011, a dust sensor for PM10 and PM2.5.
The category of the library is sensors The link to the library on the GitHub below:
https://github.com/ricki-z/SDS011

Thank you for the great Arduino team

Rajko Zschiegner

[cmaglie]

Done!