Added a container class for a single feature. For now it has only properties.
1. In SSDSingleFeature the properties names were shortened.
2. Added ClassificationLogic which contains the trivial algorithm which classifies a feature based on the value and effort associated with it.
1. Added gitignore
2. SSDSignleFeature - properties names were simplified and the 'm' was removed
1. Added navigation controller, embedded the table view in it
2. Added a "New Feature" view, creating a form for adding a new feature