added new tests

src/main/java/mi/hdm/recipes/Ingredient.java

src/main/java/mi/hdm/recipes/IngredientManager.java

src/main/java/mi/hdm/recipes/RecipeManager.java

src/test/java/mi/hdm/recipes/IngredientTest.java

src/test/java/mi/hdm/recipes/NutritionTableTest.java

src/test/java/mi/hdm/recipes/ValidObjectsPool.java