[Docs]: Proper Plugin Development Documentation

[Mcrich23]

Feature or enhancement request details

This issue is a beginning of a discussion to draft new documentation for developing plugins for container. This will build on #603, #571, #625, and #717.

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[Mcrich23]

@jglogan Bringing this issue to your inbox.

[Mcrich23]

Here is my rough idea of an outline for documentation. Thoughts before I begin?

Developing A Plugin

Integrating with high level commands

Passing down OptionGroups

Working directly with the APIs

Submitting A Plugin

Adding a plugin to the makefile

[Mcrich23]

@dcantah @katiewasnothere thoughts before I proceed?

[katiewasnothere]

@Mcrich23 Might be nice to have a section on like "using a plugin" from a code perspective. To answer the question of "how do I call into my plugin once it has been loaded". But otherwise, this looks good to me. Thanks for looking into this :)