Write test script to run API

[hanneoberman]

• Read https://growthcharts.org/james
• Read https://restrserve.org/articles/RestRserve.html
• Read https://httr2.r-lib.org/
• Copy https://github.com/growthcharts/james/blob/master/vignettes/articles/getting_started.Rmd to create mice version of https://james.groeidiagrammen.nl/
• Edit table in getting_started (use link tot mice data: https://amices.org/mice/reference/#datasets)
• generalize the james endpoint \version to webmice endpoint
• add example how to call webmice from R (and document it)
• how to set up docker
• how to sent an R/bash command to it