Start of some core domain scenarios.

Note: I want to be sure that I drive these BDD->TDD without Rails and using PORO as much as possible
broken but in progress
Added first pass of brainstorming notes. Free-form thoughts on Camping app
Added CONTRIBUTE markdown doc.
Updated README. Cleaned up and referencing NOTES and CONTRIBUTE docs
Added more details to the CONTRIBUTE document. Possible starting points for coding exploration.