Added init and started adding the recommendation function

recommendations/WindowsRecommendations.py

@@ -1,7 +1,33 @@
+from typing import List
+from backend.Property import Property
+from recommendations.Costs import Costs
+
+
 class WindowsRecommendations:
 
-    def __init__(self):
-        pass
+    def __init__(self, property_instance: Property, materials: List):
+        self.property = property_instance
+        self.costs = Costs(self.property)
+
+        self.recommendations = []
+
+        self.glazing_materials = [
+            material for material in materials if material["type"] == "window_glazing"
+        ]
+
+        # TODO: This will be populated with the works associated to upgrading glazing. This will involve removal of
+        # previous glazing and installation of new glazing. This will not include the cost of the windows material
+        # themselfs
+        self.glazing_works_materials = []
 
     def recommend(self):
-        pass
+        """
+        This method will recommend the best possible glazing options for a property.
+
+        In order to do this, we need to estimate the number of windows that the home has. This information will be
+        stored in the property object, under property.number_of_windows
+        :return:
+        """
+
+        if not self.property.number_of_windows:
+            raise ValueError("Number of windows not specified")