Add formatters, tests.

src/fmt/__init__.py

@@ -0,0 +1 @@
+

src/fmt/abstract_formatter.py

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+from abc import ABC, abstractmethod
+
+class AbstractFormatter(ABC):
+    @abstractmethod
+    def format(self, obj) -> str:
+        pass
+
+    @abstractmethod
+    def format_all(self, objs) -> str:
+        pass
+

src/fmt/city_formatter.py

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+from src.fmt.abstract_formatter import AbstractFormatter
+
+class CityFormatter(AbstractFormatter):
+    def format(self, city) -> str:
+        name = city['name']
+        return f"- {name}\n"
+
+    def format_all(self, cities: dict) -> str:
+        formated_message = "Cities:\n\n"
+
+        for city in cities['data']:
+            formated_item = self.format(city)
+            formated_message += formated_item
+
+        return formated_message
+