Add a package.json to allow installing the plugin into cordova
Add a package.json to allow installing the plugin into cordova

This is part of the cordova-7 changes
https://cordova.apache.org/news/2017/05/04/cordova-7.html

> Platforms and plugins are now required to have a package.json file

e-mission/cordova-unified-logger,e-mission/cordova-unified-logger,shankari/cordova-unified-logger,shankari/cordova-unified-logger