Create User class

[RayHamps03]

The user class needs to be created to represent users registered to the website. The following properties need to be implemented:

• int UserId, the primary key for each user.
• string Username, the inputted username of the user.
• string Password, the password needed for the user to login to the website.
• DateOnly CreationDate, the date when the user was created.
• string? Bio, an optional space for users to describe themselves or any chosen information.

For future reference, when the Doodle class is created, the User class properties need to update to include a collection of Doodles created by the user.