Add Song Controller

On June 10, 2025, I mostly worked on creating the controller for adding/uploading songs, For that I had to make some tweaks to the existing uploadOnCloudinary utility function so that it can work with uploading images and audio files. I also had to make some changes to the types and model for song entity.

The code changes and updated can be viewed on the GitHub repository for Beats.

After this I think I will dive into frontend work for the Beats. For that first I need to revise concept related to frontend, After revising I will move on to work on both backend and frontend part of Beats together. Implementing other functionality on the go.