More helpful readmes for beginners

I went through the /architecture-examples/ projects, and updated the readmes with more helpful links and descriptions for beginners to the different frameworks and libraries.

I thought I'd check in to see what you guys think before I tackled too many more. I figured it makes it easier for someone to start with TodoMVC, and learn outward, as opposed to starting with other resources, and coming to TodoMVC just to see an example.

How I end every PR: happy to make changes, start over, or scrap this idea altogether!