R: Vignettes and other documentation

# Vignettes and other documentation

## Vignettes from package 'jsonlite'

jsonlite::json-aaquickstart |  | Getting started with JSON and jsonlite | HTML | source | R code
jsonlite::json-apis |  | Fetching JSON data from REST APIs | HTML | source |
jsonlite::json-paging |  | Combining pages of JSON data with jsonlite | HTML | source |
jsonlite::json-mapping |  | A mapping between JSON data and R objects | PDF | source |
jsonlite::json-opencpu |  | Simple JSON RPC with OpenCPU | PDF | source |