docs: Describe configuration for discord

[pktiuk]

Linked with: https://github.com/zorn-v/nextcloud-social-login/issues/352

[zorn-v]

What a problem ? If you know how describe spep by step - just do it.

If you just want to point to missed doc, then what a point in your message ?

[pktiuk]

@zorn-v This is a PR, I just described config step by step, and now I am submitting this piece of docs to codebase.

[zorn-v]

Oops. Sorry, considered as another issue "need help" :)

[pktiuk]

No problem.
Anyway, thanks for great app :)

[zorn-v]

You are welcome. Opensource rulezz )