Added default constructors

Sources/OpenFoodFacts/types/SelectedImage.swift

@@ -2,4 +2,10 @@ public class SelectedImage: Codable, ObjectDebugger {
     public var display: SelectedImageItem?
     public var small: SelectedImageItem?
     public var thumb: SelectedImageItem?
+
+    init(display: SelectedImageItem?, small: SelectedImageItem?, thumb: SelectedImageItem?) {
+        self.display = display
+        self.small = small
+        self.thumb = thumb
+    }
 }

Sources/OpenFoodFacts/types/SelectedImageItem.swift

@@ -6,4 +6,10 @@ public struct SelectedImageItem: Codable, ObjectDebugger {
     public var url: String {
         [en, fr, pl].compactMap { $0 }.first ?? ""
     }
+
+    init(en: String?, fr: String?, pl: String) {
+        self.en = en
+        self.fr = fr
+        self.pl = pl
+    }
 }

Sources/OpenFoodFacts/types/SelectedImages.swift

@@ -2,4 +2,10 @@ public struct SelectedImages: Codable, ObjectDebugger {
     public var front: SelectedImage?
     public var ingredients: SelectedImage?
     public var nutrition: SelectedImage?
+
+    init(front: SelectedImage?, ingredients: SelectedImage?, nutrition: SelectedImage?) {
+        self.front = front
+        self.ingredients = ingredients
+        self.nutrition = nutrition
+    }
 }