Update aauth.py to add gamecard support

[EpicUsername12]

This PR aims to add gamecard support to NintendoClients.

I made a tool that asks the console to complete the challenge, and allow the python script to pass AAuth authentication.

The repo is here: https://github.com/EpicUsername12/nx-netauth-link

Example usage here: https://github.com/EpicUsername12/nx-netauth-link/blob/master/python/example_mk8dx_get_top_competitions.py

It works well and reliably, with a very decent amount of checks.

I have tested against pre-defined values and seeds from AAuth, and they all matched what the console normally returns.

[EpicUsername12]

If you agree with adding this to NintendoClients, i will commit the gamecard example

[kinnay]

Looks good. I don't think I want to add the example script, because the purpose of NintendoClients is to do this stuff without a Switch. I could add a link to your repo to the readthedocs documentation though? If we do add an example script, I think it would be best if it focuses on the gamecard only, without MK8DX stuff around it. What do you think?

[EpicUsername12]

It will be whatever you decide, it's your software after all;

If you want to add an example script, what would it contain? Code up to the NEX login? Or code up to the AAuth token ?

I'm fine with any

[kinnay]

I added a link to your repo to the documentation.