feat: add city and weather art models

- Create City model with attributes: name, country, latitude, longitude, and featured.
- Create WeatherArt model with attributes: weather_date, weather_condition, description, and prompt.
- Add migration files for creating cities and weather arts tables.
- Include fixture files for cities and weather arts for testing.
- Add basic test files for both models.

These changes introduce new models and database tables to support
city and weather art data, enabling future features related to
weather information and city management.

app/models/city.rb

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+class City < ApplicationRecord
+end

app/models/weather_art.rb

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+class WeatherArt < ApplicationRecord
+end

db/migrate/20250117093758_create_cities.rb

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+class CreateCities < ActiveRecord::Migration[8.0]
+  def change
+    create_table :cities do |t|
+      t.string :name
+      t.string :country
+      t.decimal :latitude
+      t.decimal :longitude
+      t.boolean :featured
+
+      t.timestamps
+    end
+  end
+end

db/migrate/20250117095400_create_weather_arts.rb

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+class CreateWeatherArts < ActiveRecord::Migration[8.0]
+  def change
+    create_table :weather_arts do |t|
+      t.date :weather_date
+      t.string :weather_condition
+      t.text :description
+      t.string :prompt
+
+      t.timestamps
+    end
+  end
+end

test/fixtures/cities.yml

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+# Read about fixtures at https://api.rubyonrails.org/classes/ActiveRecord/FixtureSet.html
+
+one:
+  name: MyString
+  country: MyString
+  latitude: 9.99
+  longitude: 9.99
+  featured: false
+
+two:
+  name: MyString
+  country: MyString
+  latitude: 9.99
+  longitude: 9.99
+  featured: false

test/fixtures/weather_arts.yml

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+# Read about fixtures at https://api.rubyonrails.org/classes/ActiveRecord/FixtureSet.html
+
+one:
+  weather_date: 2025-01-17
+  weather_condition: MyString
+  description: MyText
+  prompt: MyString
+
+two:
+  weather_date: 2025-01-17
+  weather_condition: MyString
+  description: MyText
+  prompt: MyString

test/models/city_test.rb

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+require "test_helper"
+
+class CityTest < ActiveSupport::TestCase
+  # test "the truth" do
+  #   assert true
+  # end
+end

test/models/weather_art_test.rb

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+require "test_helper"
+
+class WeatherArtTest < ActiveSupport::TestCase
+  # test "the truth" do
+  #   assert true
+  # end
+end