This is a helloworld package in R that should just work. It doens't do anything complicated and it serves as a starting point for people who want to make a start at having their own package on github. You can varify that it works by doing:
devtools::install_github('koaning/helloworld')
helloworld::hello('foobar')
Add the following code to your website.
For more information on customizing the embed code, read Embedding Snippets.