added image model

Author: brandonzorn

nlightreader/models/__init__.py

@@ -2,3 +2,4 @@
 from .chapter_model import Chapter
 from .character_model import Character
 from .sort_models import Order, Kind, Genre
+from .image_model import Image

nlightreader/models/image_model.py

@@ -0,0 +1,28 @@
+from types import NoneType
+
+import validators
+
+
+class Image:
+    def __init__(self, image_id: str, page_number: int, url: str | None):
+        self.id = image_id
+        self.page_number = page_number
+        self.__url = None
+
+        self.url = url
+
+    @property
+    def url(self):
+        return self.__url
+
+    @url.setter
+    def url(self, url: str | None):
+        if not isinstance(url, (str, NoneType)):
+            raise TypeError(f"Url must be str or None got {type(url)}")
+        if url is not None and not validators.url(url):
+            raise ValueError(f"Url {url} is not valid")
+        self.__url = url
+
+    @staticmethod
+    def get_empty_instance():
+        return Image("", 1, None)