Richfield website developers are tasked with building a secure login system for its users. As part of this project, you are required to:Create a Database and a User Table:Create a MySQL database named richfield$\_$users.Within this database, create a table named users with the following fields:username $($VARCHAR$(50),$ UNIQUE$)$password $($VARCHAR$(255))$ Create a Registration Page: Users should be able to register by providing a username and password. The password should be stored in the database. Upon successful registration, the user should be redirected to the login page.Create a Login Page: Allow users to log in using their registered username and password. If the credentials are correct, start a session, store the username in the session, and redirect the user to a welcome page. If the credentials are incorrect, display an error message.Create a Welcome Page: This page should display a welcome message that includes the username of the logged$-$in user. Ensure that users cannot access this page unless they are logged in$.$ If a user tries to access this page without being logged in$,$ redirect them back to the login page.Handle Sessions: Ensure that sessions are used to keep users logged in while navigating the website. Include a logout option that will destroy the session and redirect the user to the login page.You are required to implement the necessary PHP code for each page $($registration$,$ login$,$ welcome, and session handling$).$ Use MySQL for storing the user data.