✨ Added Edit song Feature

[adeeteya]

All Submissions:

• Have you followed the guidelines in our Contributing document?
• Have you checked to ensure there aren't other open Pull Requests for the same update/change?

New Feature Submissions:

1. Does your submission work for all the platforms (android,windows and web app)?
2. Have you lint your code locally before submission? (using flutter_lints package)

Changes to Core Features:

• Have you added an explanation of what your changes do and why you'd like me to include them?
• Have you added the feature to the features column of readme.md ?