feat: add delpoy files

docker-compose.yml

k8s/backend-claim0-persistentvolumeclaim.yaml

k8s/backend-claim1-persistentvolumeclaim.yaml

k8s/backend-claim2-persistentvolumeclaim.yaml

k8s/backend-claim3-persistentvolumeclaim.yaml

k8s/backend-deployment.yaml

k8s/backend-service.yaml

k8s/database-agent-claim0-persistentvolumeclaim.yaml

k8s/database-agent-deployment.yaml

k8s/database-agent-service.yaml

k8s/nginx-claim0-persistentvolumeclaim.yaml

k8s/nginx-deployment.yaml

k8s/nginx-service.yaml