add app manifest file for frontend caching

[vrocha]

let's make the app cache as much as possible on the frontend for a speedy user experience

[flowersw]

@victor-rocha , Hi, Will Flowers here. Do you have any recommendations for strategy or tools to do this? Something like this, perhaps? https://docs.angularjs.org/api/ng/type/$cacheFactory.Cache. Thanks.

[flowersw]

Using just a manifest file to cache seems pretty straight-forward. I'm still unsure of exactly what should be cached and what shouldn't be cached...

[flowersw]

I think that the method of using a manifest file to do caching has/is being deprecated : https://github.com/jmdobry/angular-cache . At this point, what are other places/recommended for caching. I'll look into this as well https://github.com/jmdobry/angular-cache