added SearchController and Model Classes

added:
- SearchController (Find ActionMethod)
- Model Classes (Address.cs, Listing.cs, APIObject.cs)
- _BrowserLayout

todo:
- format search params
- edit results layout table
- Week 3 tasks
- Week 4 tasks
- About page
- Contact Page
Merge pull request #2 from elmi-/master

added SearchController and Model Classes