Added abstract module

hc_spider/abstract.py

@@ -0,0 +1,15 @@
+from abc import ABC, abstractmethod
+from hc_spider.model import SharedObjects, Response, ResponseError
+
+
+class SpiderAbs(ABC):
+    _shared_objects: SharedObjects
+
+    def __init__(self, shared_objects: SharedObjects) -> None:
+        self._shared_objects = shared_objects
+
+
+class ISpider(SpiderAbs, ABC):
+    @abstractmethod
+    def get_links(self, url: str) -> Response | ResponseError:
+        pass