Add SoundSpace music player for issue #958

[cobie1818]

Developer Checklist

• Followed the project contribution instructions in the README.
• Used the required directory structure: MusicPlayer/cobie1818/.
• This pull request contains only one project.
• Starred the repository (optional).

Summary

Adds SoundSpace, a responsive music player built with HTML, CSS, and vanilla JavaScript.

Related to #958.

Users can select multiple audio files from their device and play them locally without uploading them. Features include:

• Play and pause controls.
• Previous and next track navigation.
• A clickable playlist with the selected track highlighted.
• Track seeking, elapsed time, and duration.
• Volume adjustment.
• Automatic advancement through the playlist.
• Labeled controls, visible keyboard focus, and playback status messages.

Includes a README with setup instructions, features, limitations, and a manual testing checklist. No external libraries or API keys are required.

Testing

Manually tested multiple-file selection, play/pause, previous/next navigation, playlist selection, track seeking, volume, keyboard controls, and the layout at a narrower browser width.

Ran git diff --cached --check and corrected trailing whitespace before committing. Verified that the commit contains only the five intended project files.

No automated test suite was added.

Screenshots / GIFs

Live Project Link

Not deployed. To run locally, open MusicPlayer/cobie1818/index.html in a browser and select audio files from your device.