Convert readme to readme.Rmd and get graphs to plot

I think you could take the readme as it is, save it as a .Rmd file, add the appropriate header, knit it, and we'd have a fancy readme with lots of graphs. This could then be the "testing platform" for our graphs:

---
title: "README"
author: "R"
date: "`r format(Sys.time(), '%d %B, %Y')`"
output:
  md_document:
    variant: markdown_github
---

Also would need to remember to add the .Rmd and corresponding images to the .Rbuildignore

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