Added 3 files to HotelFinder

- hotel.rb = creates hotel objects
  * initializes each object with name, city, phone number,
  single beds, and double beds
  * to_s method prints out the hotel object with all the info
- hotel_finder.rb = creates list of hotels
  * reads csv file into hotel objects
  * lists all the objects to screen
  * can search for a hotel by name
- main.rb = starts up the program
- Hotel.csv = contains the data
Naming of `NullObject` is incredibly confusing. What is the `NullObject` for? Is it for a Hotel? It's not immediately apparent to me.