Added demo project showing an example of using localizations
Demo project installs NStack via Carthage; I did it like this because I'm hoping to also use the demo project to test out potential new branches of the localization manager without having to make a release, and with carthage I can better contorl which branch or commit of a dependency is used
Added a Documentation folder where I plan to add more detailed usage and future migration guides. I've also added there the migration guide to NStack 5 (the translations -> tocalizations renaming)
Added step by step guide on setting up a new project with NStack in the README (amazing how little and outdated documentation we had before 🙈); not saying this is perfect, but it's better
Fixes #66 Progress on #40