feat: added docker support

[lakshita10341]

closes #105

[Copilot]

Pull Request Overview

Adds Docker support to enable containerized deployment of the full-stack application with client, server, and MongoDB services.

• Implements multi-container setup with docker-compose.yml orchestrating client, server, and MongoDB services
• Adds production-ready Dockerfiles for both client (nginx-served static build) and server (Node.js)
• Updates client socket configuration to support environment-based URLs for container networking

Reviewed Changes

Copilot reviewed 7 out of 7 changed files in this pull request and generated no comments.

Show a summary per file

File	Description
docker-compose.yml	Orchestrates three services with proper networking, port mapping, and volume configuration
client/Dockerfile	Multi-stage build creating optimized nginx-served production client
server/package.json	Adds production start script for containerized deployment
client/src/socket.js	Enables environment-based socket URL configuration for container networking
client/.dockerignore	Excludes unnecessary files from client Docker build context
server/.dockerignore	Excludes unnecessary files from server Docker build context
README.md	Documents Docker deployment process and usage instructions

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[lakshita10341]

please review my PR and suggest me changes if any

[lakshita10341]

Is there some problem with code?