Simpler native storage solution

[brody4hire]

I recently discovered https://github.com/TheCocoaProject/cordova-plugin-nativestorage which looks like a simpler solution for "native storage of variables" on Android/iOS/Windows. Please add it to http://cordova.apache.org/docs/en/latest/cordova/storage/storage.html.

I found it in a comment on https://www.sitepoint.com/storing-local-data-in-a-cordova-app/, maybe also good to add a pointer to this guide to storage.html.

Major advantages of the Cordova sqlite plugin that I maintain include the incredible flexibility of SQL, support for batch transactions, and consistent support across all major mobile platforms Android/iOS/Windows.