Add Kubernetes Deployment, Service, and HPA Manifests for Frontend and Database

[sharmaaakash170]

Summary

This PR introduces Kubernetes configuration files for the MEAN stack application, including:

• ✅ Deployment and Service manifests for the frontend.
• ✅ Deployment and Service manifests for the MongoDB database.
• ✅ Horizontal Pod Autoscaler (HPA) for the frontend for better scalability.

These configurations aim to make the application cloud-native, improving its portability and production-readiness.

Benefits

• Supports container orchestration with Kubernetes.
• Enhances scalability and resource management with HPA.
• Lays the groundwork for CI/CD and infrastructure-as-code practices.

Looking forward to feedback and suggestions!