OIDC documentation

[jgribonvald]

Is your feature request related to a problem? Please describe.
Providing a documentation on OIDC possibilities would help a lot, like explaining all endpoints available, that groups and claims filters exist, and using the OAuth endpoint for clients.

[555vedant]

@jgribonvald for this doc i am assuming OAuth 2.0 is it fine ??

[ChristianMurphy]

@555vedant OIDC and OAuth 2.0 are both fairly well documented.
uPortal implements custom claims, and a specific three legged auth flow which are more specific and would be more useful to have docs on.