Add architecture link to event driven. Mention workflow.

[mrfito]

Add architecture link to event driven. Mention workflow.

[mrfito]

I agree that event driven has 5 starts only in workflow and the other architecture have more for cost, simplicity. However, we never say anywhere in the readme that we pick only on most number of starts... and we don't say why we pick those other architectures so it is hard only to add this one in isolation.