Add Online Documentation

[nickclark2016]

When using this, it may be useful to add some documentation and then use a docgen tool (doxygen maybe?) to create docs. It'd be nice to have docs set up to be hosted from github pages so I can easily view the docs without relying on an IDE to preview it.

[charles-lunarg]

I'm adding the information from the other issue about creating more docs, rather than having two separate issues for the same thing.

• A general overview of the different components.
• A list of various problems and their vk-bootstrap API solutions.
• Document the inner workings of the API
  • Which data is passed between the components
  • Automatically enabled extensions
  • Design rational of assumptions & choices

[charles-lunarg]

Well I enabled github.io pages and it uses the Readme.md. But i'll have to figure out a code documentation tool as well as write a longer/better guide to using the library.