Practice creating a class with both a default and a parameterized constructor. Your goal is to implement a Book class that can be initialized with or without specifying the title and author.

• The class must have two public string fields: Title and Author.
• The default constructor must set both Title and Author fields to "Unknown".
• The parameterized constructor must accept two string parameters and assign them to the Title and Author fields, respectively.
• Creating a Book without parameters must initialize it with "Unknown" values.
• Creating a Book with parameters must initialize it with the provided values.