Add documentation

## Documentation

The documentation essentially consists of the

[example](./example/ornl-template-example.tex). To build the example,

[example](./example/ornl-template-example.tex). Commands that should be defined

in the document header are:

| Command      | Description                               |

| ------------ | ----------------------------------------- |

| `\author`    | Author names, joined by `\and`.           |

| `\title`     | The tech memo's title.                    |

| `\date`      | The publication date.                     |

| `\division`  | Your ORNL division name.                  |

| `\reportnum` | Report number; omit if still a draft.     |

The following commands belong in the document. They create the title pages and

set up document styling for the three main sections of the document.

| Command           | Description                               |

| ------------      | ----------------------------------------- |

| `\frontmatter`    | Create title page and set up TOC styles.  |

| `\mainmatter`     | Begin the main content of the document.   |

| `\appendix`       | Begin appendices.                         |

## Limitations