Document resource parameter usage and isolation enhancements in IdentityServer

[maartenba]

No description provided.

[AndersAbel]

Should we mention that the RFC allows multiple resource params while the MS handler only supports a single value?

[maartenba]

May be helpful. Would you do this in the client examples or earlier showing the HTTP?

[AndersAbel]

May be helpful. Would you do this in the client examples or earlier showing the HTTP?

I guess most people will just use one resource, so I don't think we need to spend too much work on it in the docs. But someone that reads the spec might be confused. I'd just add a sentence in the intro saying the spec allows multiple resource params and then in the code examples for ASP.NET Core point out that the handler only supports a single param.

[maartenba]

Added it under the OIDC handler example now