Add DynamoDb support

db_service.py

@@ -0,0 +1,15 @@
+from abc import abstractmethod
+
+
+class DbService:
+
+    def __init__(self) -> None:
+        super().__init__()
+
+    @abstractmethod
+    def get_fact(self):
+        raise NotImplementedError
+
+    @abstractmethod
+    def get_multiple_facts(self, count=5):
+        raise NotImplementedError