Add script to shift subtitles forward or backward

[Syed-56]

The repository currently lacks a script to shift subtitle timings forward or backward, which is needed when subtitles are out of sync with the video.

A simple Python script or function could be added to shift subtitle timestamps by a specified offset (positive or negative), preferably supporting .srt files via command-line arguments.

At the moment, this can be done using external tools like Subtitle Edit or ffmpeg, but having this functionality in the repo would keep workflows consistent and easier to automate.

This would be especially useful for handling audio/video delays or re-encoded media files.

[github-actions]

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