R: Vignettes and other documentation

# Vignettes and other documentation

## Vignettes from package 'tern'

tern::missing_values |  | Missing Values in Tern | HTML | source | R code
tern::tables |  | Tabulation | HTML | source | R code
tern::tern |  | Introduction to tern | HTML | source | R code
tern::tern_formats |  | Formatting Functions | HTML | source | R code
tern::tern_functions_guide |  | Understanding `tern` functions | HTML | source | R code