added provider for recipe wizard

lib/models/ingredient_list_entry.dart

@@ -8,4 +8,14 @@ class IngredientListEntry {
   final bool optional;
 
   IngredientListEntry(this.ingredient, this.amount, this.unit, this.optional);
+
+  @override
+  bool operator ==(Object other) =>
+      identical(this, other) ||
+      other is IngredientListEntry &&
+          ingredient == other.ingredient &&
+          amount == other.amount;
+
+  @override
+  int get hashCode => Object.hash(ingredient.hashCode, amount.hashCode);
 }