Discussed in #7
Following the discussion of the Top-level API in https://github.com/orgs/easyscience/discussions/29, the `SampleModel` object is one of the 5 main objects in the API which the user will interact with.
The `SampleModel` object is responsible for defining the theoretical idealized sample to compare the data to.
The `SampleModel` object is the top-level model object containing both the `Structure` object, explaining the structure of the sample, and the `Physics` object, containing the parameters for the used physics model. It will additionally contain a number of utility methods.
Discussed in #7