How to contribute to "Libraries for Arduino" in Playground?

Hi, we'd like to add a library to

The description says "A collection of contributed libraries."

What does "contributing" mean here? (Our library is "Simplified BSD" licensed.)

Is there something like an Arduino contributors agreement or any need to transfer the copyright?

Kind regards,

Just simple .
create folder in library. Now you need to add your header file and relevant code file in the same folder.
reopen your arduino IDE. search example or

sketch>import library>Choose folder

It should work