Documentation: Documented spec

[evankanderson]

Deliverable

A written spec (document) explaining, for the entire eventing repo:

1. The object model and relations between objects
2. The fields on each object
3. The rationale for the structure ("why not combine X and Y"?)
4. Description (example) of using an implementation to fulfil a customer scenario
5. Documentation of common error types
6. Documentation about extensibility points -- what can be extended, and what work is needed to create a new implementation (buses and sources, presumably)
7. Description (example) of operator flow for installing an additional source
8. Description (example) of operator flow for installing an additional bus

[evankanderson]

/assign @n3wscott

[evankanderson]

/close

This is done by #482

[knative-prow-robot]

@evankanderson: Closing this issue.

Details

In response to this:

/close

This is done by #482

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