Is an example of a simple ASP.NET Core API and Xamarin.Forms client. There is a blogpost with all the details about this project on my blog.
Has an integrated Swagger that is used to generate the client code.
The API consumer code is generated using NSwag:
dotnet dotnet-nswag.dll swagger2csclient /input:swagger.json /classname:BlogService /namespace:BlogReader /output:BlogService.cs