Document a workflow for people learning how to use GatorGrader

[gkapfham]

One problem that we have identified with the existing documentation in this repository and in the repository for GatorGrader's Gradle plugin is that it is hard to know "where to start" if you want to learn how to use this tool.

We should start to think more carefully about:

• Easiest way to learn how to use the tool
• Better tutorials that include screenshots and/or movies
• Ways to host this content on the web site
• How to integrate the web site into the README file and other repository files

[gkapfham]

One idea to consider is #207. Would that idea make it easier to use GatorGrader?

Let me know what you think, okay?