Chapter 4 Writing a chapter
We will now create a single chapter in RMarkdown.
There is a lite and a heavy duty version of this.
The lite version will help us learn:
- the minimal components of a 
bookdownchapter 
Go to the lite version in exercise 2 in Section 8.2
The heavy-duty version will help us learn how to incorporate:
- data
 - helper .R script
 - citations
 - figures/tables
 
Go to the heavy-duty version in exercise 3 in Section 8.3