add abstraction ob platform and article + vinted

"

Signed-off-by: Omar Sánchez Pizarro <omar.sanchez@pistacero.net>

models/__init__.py

@@ -0,0 +1,2 @@
+# Models module
+

models/article.py

@@ -0,0 +1,61 @@
+import datetime
+
+class Article:
+    """Generic article model for any marketplace platform"""
+    
+    def __init__(self, id, title, description, price, currency, location, 
+                 allows_shipping, url, images, modified_at, platform):
+        self._id = id
+        self._title = title
+        self._description = description
+        self._price = price
+        self._currency = currency
+        self._location = location
+        self._allows_shipping = allows_shipping
+        self._url = url
+        self._images = images
+        self._modified_at = modified_at
+        self._platform = platform
+
+    def get_id(self):
+        return self._id
+
+    def get_title(self):
+        return self._title
+
+    def get_description(self):
+        # Return only 500 characters
+        return self._description[:500] + "..." if len(self._description) > 500 else self._description
+
+    def get_price(self):
+        return self._price
+
+    def get_currency(self):
+        return self._currency
+
+    def get_location(self):
+        return self._location
+
+    def get_allows_shipping(self):
+        return "✅" if self._allows_shipping else "❌"
+
+    def get_url(self):
+        return self._url
+
+    def get_images(self):
+        return self._images
+
+    def get_modified_at(self):
+        return self._modified_at
+    
+    def get_platform(self):
+        return self._platform
+
+    def __eq__(self, article):
+        # Two articles are equal if they have the same ID and platform
+        return self.get_id() == article.get_id() and self.get_platform() == article.get_platform()
+
+    def __str__(self):
+        return f"Article(platform={self._platform}, id={self._id}, title='{self._title}', " \
+               f"price={self._price} {self._currency}, url='{self._url}', modified_at='{self._modified_at}')"
+