added provider for recipe wizard

lib/src/enums.dart

@@ -16,6 +16,7 @@ enum Difficulty {
 }
 
 enum IngredientType {
+  notSelected,
   vegetable,
   meat,
   fish,
@@ -28,6 +29,7 @@ enum IngredientType {
 }
 
 enum MealCategory {
+  notSelected,
   // Main Meals
   breakfast,
   brunch,
@@ -44,6 +46,7 @@ enum MealCategory {
 }
 
 enum Cuisine {
+  notSelected,
   // Asian Cuisines
   chinese,
   japanese,