Initial demo - intro to ggplot

Start with a new file
Import the necessary code library

(Note to self - the previous commit should have had an return character
at the end!)
Load in some dummy data

The ggplot library includes several datasets we can use to explore the
ggplot functionality.

- *diamonds*: a set of data describing the properties of over 50,000
diamonds;
- *movies*: a set of records from IMDB.com containing summary reviews
of over 50,000 movies