Add a concorda-example app

[AdrianRossouw]

To show off the integration of the client / server, we should ship with a concorda-demo that shows you how to log into the app.

we could disable it by default.

[mirceaalexandru]

@AdrianRossouw we can use something like this
https://github.com/Concorda/concorda-client-demo

or you think on a React demo application?

[AdrianRossouw]

we can definitely start from there.

i wasn't thinking react as much as just some basic forms and javascript.