R: Vignettes and other documentation

# Vignettes and other documentation

## Vignettes from package 'osmextract'

osmextract::osmextract |  | Introducing osmextract | HTML | source | R code
osmextract::providers |  | Add new OpenStreetMap providers | HTML | source | R code
osmextract::providers_comparisons |  | Comparing the supported OSM providers | HTML | source | R code
osmextract::tips-and-tricks |  | tips-and-tricks | HTML | source | R code