F# load configuration from appsettings, environment, command line

Simple example to load configuration using F# and ConfigurationBuilder.

I want to load an option defined by:

The appsettings.json file:

{
  "TestOptions": {
    "Option1": "1",
    "Option2": "2"
  }
}

The Expecto tests:

The files in a working Expecto test project.

Reference the following packages in order for the project to work: