Added foundation and high voltage. Readme updates, too.

# What changed

 * Added the `rails-foundation` gem.
 * Added `pages/welcome.html.erb` as the default page (via `high_voltage` gem, not `routes.rb`)
 * Changed the file permissions on several files (what happened...?)
 * Updated the readme to have better explanations of things.

# What's next

@ghislaineguerin : Let me know if you need anything moved around. All the stuff that is there at the moment is just scaffolding. Feel free to remove it if you need to.