title: First-line paragraph indenting in PDFs using R Markdown
body: <p>I'm hoping this is a question with a simple answer. I am using Rmarkdown/knitr to author a PDF document (in RStudio). Many LaTeX classes (like article) automatically indent the first line of a paragraph of text, but Rmarkdown does not, nor can I figure out a way to do so.</p>
  
  <p>Here's a simple example:</p>
  
  <pre><code>---
  title: "minimal"
  author: "prison rodeo"
  output: pdf_document  
  ---
  
  This is an R Markdown document. 
  
  I would like this paragraph to be first-line indented, but it is not.
  </code></pre>
  
  <p>Using > indents the entire paragraph, which is not what I'm looking for. I've tried spaces/tabs at the beginning of each paragraph, and using \indent; neither seems to work. Any ideas?</p>