Support Duende Identity instead of just IdentityServer4

[murugaratham]

Nice extension which i don't really understand why IdentityServer don't bake this into it's core. But since IDSvr is now changing to Duende, will you release a Duende extension?

The type 'IIdentityServerBuilder' exists in both 'Duende.IdentityServer, Version=5.0.5.0, Culture=neutral, PublicKeyToken=null' and 'IdentityServer4, Version=4.1.2.0, Culture=neutral, PublicKeyToken=f294d0afe402bb2b'

[Nordes]

I will look into it maybe later this week. I guess the port will be quite straight forward.

I was a bit shocked by the new pricing ;), but at least they still have some free tiers (https://duendesoftware.com/specialoffers).