add mongodb to the app

[armanvirus]

i think it will be much better to add mongodb to the app, so that the project will demonstrate how to create a fullstack app with electron, which has transportable embedder db within exe package.

[frankhale]

I've got a update that I haven't commited yet that uses Sqlite. I'm not sure I want to add mongodb to this repo. I may spin it off for more complex scenarios. The Sqlite update doesn't require spawning anymore process but mongodb would. I'm not opposed to it but I think it would be better suited for a more comprehensive example using a proper web framework like React, Vue or Angular as well to show off what can be done.

[armanvirus]

Ok, i got your point.