Creates bar model, controller, and views (new, create, show, index)

* Can create and show a bar
* Adds validations for bar model fields
* Creates index, new, show views and bar partial
* Creates error messages partial
do what it says I think that means it would look something like 

```ruby
validates_uniqueness_of(
  :name,
  scope: [:address, :city, :state]
)