Improve documentation for adding plugins

Registered by Steve McLellan

Improve the documentation for developers writing new plugins. For instance:
* plugin structure
* where does data come from
* how do i generate test data
* how do i know what notifications there are and what do they look like

Blueprint information

Status:
Complete
Approver:
Travis Tripp
Priority:
High
Drafter:
Steve McLellan
Direction:
Needs approval
Assignee:
Steve McLellan
Definition:
Approved
Series goal:
Accepted for newton
Implementation:
Implemented
Milestone target:
milestone icon newton-1
Started by
Travis Tripp
Completed by
Travis Tripp

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