title: Including git code in the rmarkdown documents while using bookdown
body: <p>Is there any way possible to include code for different languages in <code>Rmarkdown</code> documents while authoring books using <code>bookdown</code> package? I have looked at the <code>knitr</code> option like <a href="https://yihui.name/knitr/options/" rel="nofollow noreferrer"><code>engine</code></a> with possible values like <code>python</code>, <code>awk</code>/<code>gawk</code> and the executable path can be set using <code>engine.path</code>. </p>
  
  <pre><code>```{r, engine='python'}
  print "Will this code chunk be hidden?"
  ```
  </code></pre>
  
  <p>However, I would like to just insert code (eg: <code>git</code>) in the Rmarkdown document without executing it. </p>
  
  <p>For example, like including in the markdown documents</p>
  
  <pre><code>```git
  git init
  ```
  </code></pre>