R: Vignettes and other documentation

# Vignettes and other documentation

## Vignettes from package 'unifiedml'

unifiedml::formula_vs_matrix |  | Matrix or Formula interface | HTML | source | R code
unifiedml::unifiedml-benchmark |  | Use `unifiedml` for benchmarking models | HTML | source | R code
unifiedml::unifiedml-caret |  | Use `unifiedml` with caret without tuning | HTML | source | R code
unifiedml::unifiedml-predict-proba |  | Predict proba | HTML | source | R code
unifiedml::unifiedml |  | Introduction to R package `unifiedml` | HTML | source | R code