Add formatters, tests.

tests/fmt/test_city_formatter.py

@@ -0,0 +1,12 @@
+import pytest
+from src.fmt.city_formatter import CityFormatter
+
+def test_city_format():
+    city = {'name': 'Chernihiv'}
+
+    formatter = CityFormatter()
+
+    city_fmt = formatter.format(city)
+
+    assert '- Chernihiv\n' == city_fmt
+