Slight Improvements

[aswnss-m]

I have made Two changes to the file

1. Added an auto delete method after converting to mp3

• When we download videos using option 3 , ie: for converting to mp3 . After the successfull completion the .mp4 file has no use, so that file is automatically deleted

2. Added a requirements.txt file

• This is to make the downloading of dependencies much easier
• pip intsall -r requirements.txt
• This will install the dependency