Add README section for local development with Docker

[imDarshanGK]

Summary:
Add README section for local development with Docker

Steps to reproduce / context:

1. Describe how to reproduce or where the problem appears.
2. Include sample inputs, environment, or a short reproduction recipe.

Expected behavior:
Describe what should happen when the issue is resolved, and how success can be verified.

Suggested fix / approach:
Provide concrete pointers for implementers: files to change, algorithms to update, or libraries to consider.
If unsure, propose a minimal safe change.

Notes:
Any compatibility considerations, potential risks, or links to related code/tests/docs.

[vanshikagupta2005]

Hi @imDarshanGK ,I am Vanshika Gupta,a beginner in GSSoC'26. I have created README file previously as a part of GSSoC'26 Contribution._ would love to work on this issue.
Please assign this issue to me!
GitHub profile:https://github.com/vanshikagupta2005

[Unnati9945]

Hi, I am a GSSoC 2026 contributor and would like to work on this issue. I can help improve the README by adding a clear local development setup section using Docker. Please assign this issue to me.

[vanshikagupta2005]

@imDarshanGK I have created a pull request #991 for this issue.It's my humble request to you to please review it.Thank you!