api_server.R => main of this project api_test.R => api function
just run api_server.R
you can test api on localhost/"api_address"
ex) docker run --name plumber_api -p 8000:8000 -v pwd
/api_test.R:/plumber.R rstudio/plumber /plumber.R
docker run -ti --name r-base -p 8787:8787 r-base