Implemented music-extract

[ArshiaAdhya]

FIXES #91

Wrote a simple bash script to extract the music from videos in a particular directory and store the resulting audio in another directory mirroring the original file hierarchy. The script simply stores the path to the videos folder provided in a variable and converts it into absolute path. Further, it constructs the path of the output folder to store the extracted audio.

Audio Extraction

• First, the code recursively searches through the directory to find all mp4 files in the folder.
• Next constructs the path for the output.
• The audio extraction part is performed by the 'ffmpeg' command, and encoded using the mp3 codec "libmp3lame".
• Lastly, on completion of the process, it prints a message indicating that the process has finished.

@rootCircle kindly review.

[rootCircle]

Close, LGTM! :+1: Accepted! Great work @ArshiaAdhya!!