Adding the docker support for the project

[RavinduWeerakoon]

Dockerization of the Project

• Backend Dockerfile
• Frontend Dockerfile
• Docker Compose
• Added a docker-compose.yaml file to orchestrate the backend, frontend, and PostgreSQL services.
• dockerignore Files
• Added .dockerignore files to exclude unnecessary files and directories from the Docker build context.

This change ensured that a person could run the project by using only docker-compose without any configurations.

Closes #25