This is an R Markdown presentation. Markdown is a simple formatting syntax for authoring HTML, PDF, and MS Word documents. For more details on using R Markdown see http://rmarkdown.rstudio.com.
File > New File > R Markdown…, select Presentation and then HTML(ioslides), be sure to add the Title: and Author:
When you click the Knit button a document will be generated that includes both content as well as the output of any embedded R code chunks within the document.