Add the configuration to get user data.

tui_rsync/core/ports/configuration/__init__.py

@@ -0,0 +1,3 @@
+from .user_data_paths_port import UserDataPathsPort
+
+__all__ = ['UserDataPathsPort']

tui_rsync/core/ports/configuration/user_data_paths_port.py

@@ -0,0 +1,15 @@
+from abc import ABC, abstractmethod
+
+
+class UserDataPathsPort(ABC):
+    @abstractmethod
+    def safe_create_user_data_dir(self):
+        pass
+
+    @abstractmethod
+    def get_user_db_path(self):
+        pass
+
+    @abstractmethod
+    def get_user_data_dir(self):
+        pass