I am working in Visual Studio 2019, and .net Core 2.1.1.
I am currently working on trying to get Identity Server 4's WsFederation integrated. In the latest instructions I could find, he mentions adding System.IdentityModel to the app through the project.json. Project.json seems to be deprecated now in .net core projects, and I am having a hell of a time figuring out how to add a freaking .net assembly to my project. Do I really need to just copy the file into the project and reference, cause that just seems wrong.
Instructions I am using: https://www.scottbrady91.com/Identity-Server/IdentityServer-4-SharePoint-Integration-using-WS-Federation