Create a countdown timer plugin for Wordpress

I am creating a Wordpress page to embed videos of the exercises that a user should do. Under each video, I want a simple countdown timer that tells the user how much longer he/she needs to do that particular exercise. I have looked for a simple plugin that displays a countdown timer along with 3 buttons (Start, Stop, Reset), but such thing exists. Thus I am posting this project to ask for the development of such a plugin. This project is to create a Wordpress plugin with the following attributes: 1. A plugin that can be added to a Wordpress page by use of a shortcode 2. The ability to define the default starting time (e.g., 1 minute or 1 hour or 1 day, etc.) as part of the shortcode. This sets the starting time on the clock that gets counted down 3. The display format depends on the starting time. If the default starting time involves days, the display shows dd:hh:mm:ss. If it starts with hours, the display shows hh:mm:ss. If less, shows mm:ss 4. The plugs beeps to provide the user a warning that time is running out. It beeps once at the5 second mark, the 4 seconds, 3 seconds, 2 seconds, 1 second. It gives a short ring when it gets to zero. 5. Must work with mobile web (i.e., a page displayed on an iPhone) Note that this countdown timer would be added to a single page many times -- once for each exercise shown on the page Please deliver as zip file that I can just upload to install the plug-in. Final payment made only after testing and debugging Let me know if you have any clarification questions