Add nginx platform application example with production-grade YAML

nginx-platform-app/README.md

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+# Nginx Platform Application Example
+
+This example demonstrates a production-style Kubernetes deployment using Nginx with:
+
+- Resource requests and limits
+- Readiness and liveness probes
+- Service exposure using ClusterIP
+- Clean label/selector architecture
+- Separation of concerns (deployment + service)
+
+## Files
+- `deployment.yaml` – Application deployment configuration
+- `service.yaml` – Internal service exposure
+
+## How to deploy
+
+```bash
+kubectl apply -f deployment.yaml
+kubectl apply -f service.yaml
+

nginx-platform-app/deployment.yml

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+apiVersion: apps/v1
+kind: Deployment
+metadata:
+  name: nginx-platform-app
+  labels:
+    app: nginx-platform-app
+spec:
+  replicas: 2
+  selector:
+    matchLabels:
+      app: nginx-platform-app
+  template:
+    metadata:
+      labels:
+        app: nginx-platform-app
+    spec:
+      containers:
+      - name: nginx
+        image: nginx:stable
+        ports:
+        - containerPort: 80
+
+        resources:
+          requests:
+            cpu: "100m"
+            memory: "128Mi"
+          limits:
+            cpu: "300m"
+            memory: "256Mi"
+
+        readinessProbe:
+          httpGet:
+            path: /
+            port: 80
+          initialDelaySeconds: 5
+          periodSeconds: 10
+
+        livenessProbe:
+          httpGet:
+            path: /
+            port: 80
+          initialDelaySeconds: 15
+          periodSeconds: 20

nginx-platform-app/service.yml

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+apiVersion: v1
+kind: Service
+metadata:
+  name: nginx-platform-service
+spec:
+  type: ClusterIP
+  selector:
+    app: nginx-platform-app
+  ports:
+  - protocol: TCP
+    port: 80
+    targetPort: 80