Better document the installation and behavior of plugin

[Michionlion]

Additional documentation on basic use of GatorGradle as well as its installation process should be added. Perhaps additionally a tutorial on creating a basic assignment should be created as well.

[gkapfham]

Hi @Michionlion, I also think that it would be useful if the documentation explained the directory in which the plugin installed the global version of GatorGrader. Could you please make a complete list of all of the new documentation that you would like to see in the README file?

[gkapfham]

Going forward, I would like to have simple documentation in the README that explains how to run the deploy commands for the plugin. I check the Gradle build file --- which is the rule that runs the deploy, @Michionlion? If you can give me some pointers on this issue then I will try to resolve it soon.