Add Clear Overview and OTP Workflow Explanation

[SIDDHI-1105]

Description
Hi maintainers 👋

I came across the otpauthentication repository and found it super useful — especially since it uses FastAPI and Twilio for OTP-based login. However, I noticed that the documentation currently lacks a clear explanation of:

What exactly this project does

How the OTP flow works (step-by-step)

How contributors or developers can get started with it

To make it easier for others (including myself) to understand and contribute, I’d love to suggest the following improvements:

✨ Suggested Additions:
What the Project Does
A clear introduction like:

“This project enables OTP-based user authentication in web or mobile apps using FastAPI (backend) and Twilio (SMS service). It allows users to securely log in via phone number verification.”

How It Works (OTP Workflow)
A simple step-by-step explanation of:

User submits phone number

FastAPI sends OTP using Twilio

User enters OTP

Backend verifies OTP and logs user in
Bonus: A flow diagram would be great!

Tech Stack Used

FastAPI

Twilio API

Any DB used (if applicable)

Frontend (if any)

Getting Started

Setup instructions (e.g., environment variables for Twilio SID/Auth, running the app)

Where to add improvements (e.g., UI enhancements, logging, error handling, tests)

Contributing Section

Clear guide for first-time contributors — I’d be happy to help write or improve it!

✅ Why This Matters
Helps users integrate this OTP system into their own apps

Lowers the barrier for new contributors

Makes the project more visible and developer-friendly

I’m genuinely interested in contributing and would be happy to help draft the documentation or add examples if you’d like. Just let me know!

[SIDDHI-1105]

can you explain me what your project does so that i can get started with the readme file

[Harish-2003]

Currently, we're using FastAPI as our backend framework, integrated with Twilio for OTP-based authentication. When a user enters their phone number and submits it, an OTP is sent via Twilio to the provided phone number.

The verification process works as follows:

If the OTP entered by the user is valid, the API responds with a 200 OK status and a success message.

If the OTP is invalid or expired, the API responds with an appropriate error message indicating failure.

Since the frontend is still under development, we're currently testing the API endpoints using tools like Postman and cURL to ensure the OTP flow is functioning as expected.