Add a documentation "vignette" explaining how to use the package to apply the methodology

[danielinteractive]

From this might also come prototypes for further package functions to simplify the application.

[dgkf-roche]

You can see the Julia equivalent of vignettes in the DataFrames.jl repo. Free-form articles are written as plain .md files and added to the list of files included via the Documenter.jl docs generation.

[danielinteractive]

Another good example is now https://github.com/insightsengineering/JointSurvivalModels.jl/blob/main/docs/src/FirstExample.md