Challenge: User

1. Define the User class by the class keyword.
2. The User class should have the __init__ method that takes 3 arguments:
   self - an instance of the class.
   username - user's username.
   password - user's password.
3. The __init__ method should assign arguments to the instance attributes via the self keyword.
4. Create the bob instance of the User class with any username and password.

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