Document SeaState class example

[rgcoe]

Programmatic steps to create, alter, plot, etc. SeaState objects.

[ssolson]

From our discussion, this morning documentation of how the sea state is applied to BEM vs Control solver was brought up. I offered to start a flow chart for this and I believe it fits into this issue if not lmk and I will create a separate issue.

My idea was to add detail to the current flowchart. I have modified the original flowchart changing the location of some of the blocks to better demonstrate this process. This has the advantage of potentially allowing a common reference point with more details added as needed for future detailed explanations but if I need to continually move the blocks based on the process I want to explain better this could be a slippery slope.

As you can see I have greyed out the areas not being considered. I moved the sea states above the controller and added the "Representative Spectra". Assume this is a draft and I will clean up the lines etc and that this will have its own page in the documentation explaining the detail.

My question to you guys before I go further would be should I make a separate flowchart for this process or is this template good?

[rgcoe]

@ssolson will come back to this later, general idea: don't make different versions of the diagram, try to use code/plots to illustrate the distinct frequency vectors

[H0R5E]

Suggest that we consider constructing this documentation as part of an "Error Handling" page and include information about #203 (assuming it's merged) alongside.