Createcharacters

We have created the database, created the characters views,models, controllers, factories, and tests. All things work except for the user_views_all_characters_spec on the portion that mentions the matchups. We also did not edit the user_creates_a_matchup_spec.rb since it is not in our domain. 
Add null: false and uniqueness constraints to match your models.  You can do this via a new migration:

```ruby
def up
  change_column_null :characters, :name, true
  add_index :characters, :name, unique: true
  # etc.
end

def down
  # ...
end
```