C#/ Please explain to me how to start and what i have to do and solve this Homework . Thanks!

Write a Responsive Web App named FirstResponsiveWebAppLastName and does the following:

• Has a label and input for a user's name
• Has a label and input for year of birth
• Has a submit and clear button
• Model
  • Attributes: Name, BirthYear
  • Method: AgeThisYear()
  • No Magic Numbers (HINT: Use a global constant)
• Validate user input
• On submit, displays their name and what their age will be Dec 31st of this year.