Create API Documentation

[PournimaTivatane12]

Description:

API documentation is essential for developers who want to integrate with the application.

Key tasks:

1. Add Swagger/OpenAPI documentation using tools like Flasgger or Flask-RESTPlus.
2. Include details for all endpoints:
3. Method (GET/POST/PUT/DELETE).
4. Input parameters.
5. Response structure.
6. Provide a way to interact with APIs (e.g., Swagger UI).