Introduce Dockerfiles and Docker Compose for Frontend and Backend

## Problem Statement
Setting up the development environment for new contributors can be time-consuming and error-prone due to varying local system configurations. A consistent environment is essential to streamline onboarding and ensure the project runs uniformly across all systems.

## Proposed Solution
Introduce Dockerfiles for both the frontend and backend services, along with a `docker-compose.yml` file to spin up both containers simultaneously. Docker will provide a containerized development environment, making it easier for new contributors to get started with minimal setup.

## Implementation Steps

1. **Create a `Dockerfile` for the frontend:**
- Base image: Use `node:latest`.
- Install dependencies, copy the project files, and define the start command.

2. **Create a `Dockerfile` for the backend:**
- Base image: Use `openjdk:latest` (or another backend-specific image).
- Copy the project files, install dependencies, and define the start command.

3. **Add a `docker-compose.yml` file:**
- Define services for both frontend and backend.
- Configure networking to enable communication between services.