This was a very simple project to test my php and front-end skills. It's design is somewhat like Telgeram.
The setup is simple, you must have a SQL (mySQL is preferred) local server. I used XAMPP. The credentials are "root" for username and "" for password (it's empty). Changing this is not hard but I didn't write it clean enough, you have to open every php file and see if there are changes needed or not xd.
You can fire up the site by opening index.php in your browser :)
If you set it up in an online server, it works for multiple users.