Create Simple Example Application

[payton]

Create a second example application with much simpler implementation.

This should just be a login screen and success screen.

[payton]

Create submodule to use frontend from https://github.com/spruceid/siwe-quickstart/

[pconerly]

This task was completed from examples/notepad, right?

[payton]

@pconerly no, I wanted to also add a bare bones example. No styling, two buttons, very basic.