[author] [new] Add the Playlyfe-JS-SDK library

This is the official javascript SDK for connecting apps to the gamification platform Playlyfe.
The code is from the official repo @ [https://github.com/playlyfe/playlyfe-js-sdk](https://github.com/playlyfe/playlyfe-js-sdk)

I've added auto-update config at the bottom. It's not completely clear from the documentation on the cdnjs readme that what I've added to the package.json config is good enough or not. So, I've copied mostly from other existing libraries' package.json files on the cdnjs repo.