chore(setup): setup swagger codegen and UI for backend

[CeeJayyy007]

What change does this PR introduce?

Set up Swagger UI for API documentation for the backend. Also, re-arranged the backend folder structure and added additional directories to add structure to the backend code flow

Why was this change needed?

This change was needed to set up Swagger UI for handling API documentation along with updating the folder structure for the backend code

• Closes ⚙️ Setup: swagger codegen and UI for backend/ #50

Other information (screenshots)

Checklist

• 📝 I have reviewed my code prior to submission
• ❔ Issue number has been linked (if applicable)
• 🧪 Tests have been added or updated (if applicable)
• 📖 Documentation has been updated (if applicable)
• 📸 Screenshots added (if applicable)