Add API Documentation in a Separate File

[Laxmi2707]

Description

The API endpoints are not well-documented, making it hard for developers to understand their functionality.

Steps to Implement

1. Create an API_DOCS.md file.
2. List all available API endpoints with example requests and responses.
3. Ensure the documentation is easy to follow.

Expected Outcome

Developers can easily understand the API structure.

[prakharsingh-74]

@Durgesh4993 sir please review my PR