Hello World! in Shiny

Refer to masteringshiny.org for good documentation.

1. Download R, e.g. R v4.1.2 for Windows, the latest R version (v4.1.3 as of March 2022) might not work with shinyapps.io
2. ... git clone this repo ...
3. Go to shinyapps.io, register & check your username, token and password to your apps (should be visible on the first page you land on after signing up)
4. cd shiny-hello-world/ and open R
5. install.packages("shiny")
6. rsconnect::setAccountInfo(name='very secret username', token='very secret token', secret='very secret password')
7. rsconnect::deployApp('./r_app')
8. go to https://<username>.shinyapps.io/r_app/