Describe the two main ways to create model export parameters

[DougManuel]

Broadly, there are two ways to generate the model export parameters. Suggest briefly describe the two ways and make a conceptual link to bllflow.

The two ways are:

1. Automatically generated through our workflow output (bllflow, recodeflow, etc). For example our table 1 becomes descriptive information for a model.
2. Manually transcribed from published papers other documentation. This is likely the most common path for colloborators that are external to our teams.

Suggest conceptually starting to link bllflow and model export together. For example, just provide a link to: https://github.com/Big-Life-Lab/bllflow/blob/master/assets/specs/model-csv-to-pmml/model-csv-to-pmml-spec.Rmd