Create new Rails project

Added a default gitignore file and generated a new Ruby on Rails
project.

Signed-off-by: Konrad Reiche <konrad.reiche@gmail.com>
Generate scaffolding for the metadata resource

I used the scaffolding generator to create basic CRUD functionality for
the metadata resource. Since I am still in the process of learning the
very basics of Rails I am still using SQLite, but I will probably move
soon over to ElasticSearch or MongoDB.

Signed-off-by: Konrad Reiche <konrad.reiche@gmail.com>