Write first draft of the class IngredientsAtHand

src/main/java/no/ntnu/idatt1002/demo/data/recipes/IngredientsAtHand.java

+package no.ntnu.idatt1002.demo.data.recipes;
+
+import java.util.List;
+
+public class IngredientsAtHand {
+
+    private List<Ingredient> ingredientsAtHand;
+
+    public List<Ingredient> getIngredientsAtHand() {
+        return ingredientsAtHand;
+    }
+
+    public void setIngredientsAtHand(List<Ingredient> ingredientsAtHand) {
+        this.ingredientsAtHand = ingredientsAtHand;
+    }
+
+    public void addIngredient(Ingredient ingredient) {
+        this.ingredientsAtHand.add(ingredient);
+    }
+
+    /**
+     * Returns null if no ingredient of the requested type is found in the collection.
+     * @param ingredientType
+     * @return
+     */
+    public Ingredient getIngredient(FoodItem ingredientType) {
+        return this.getIngredientsAtHand().stream()
+                .filter((ingredient) -> ingredient.getFoodType() == ingredientType)
+                .findFirst().orElse(null);
+    }
+}