Saz atruck index show

-Most models and migrations added
-Two tests added
-Unable to run at the moment due to need to switch to Postgres DB
Its much easier to read if these are each given their own line.

```ruby
validates :rating, presence: true
validates :body, presence: true
# etc
```

You also don't want to validate the presence of foreign keys. You should validate the presence of the associations instead:

```ruby
validates :user, presence: true
validates :food_truck, presence: true
```