Description:

This pull request adds a fully functional Productivity Timer app, allowing users to manage their time effectively with the Pomodoro technique. It includes focus and break intervals, visual animations, and sound notifications to enhance productivity.

Features Added:

1. Focus and Break Timer: Alternates between configurable intervals.
2. Dynamic Countdown Display: Real-time updates for session progress.
3. Sound Notifications: Alerts for session transitions.
4. Responsive Design: Works seamlessly on desktop and mobile screens.

Files Added:

1. index.html: Markup structure for the app, including timer display and buttons.
2. styles.css: Styling for the layout, animations, and responsiveness.
3. script.js: JavaScript logic for timer functionality and user interactions.