Added README section for Helm charts and examples (#461)

examples/README.md

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+# Deployment Examples
+
+This directory contains various deployment examples of the [itzg/minecraft-server](https://hub.docker.com/r/itzg/minecraft-server/) Docker image.

examples/k8s/using-statefulset.yml

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+---
+apiVersion: apps/v1
+kind: StatefulSet
+metadata:
+  labels:
+    app: example
+  name: example
+spec:
+  replicas: 1
+  serviceName: example
+  selector:
+    matchLabels:
+      app: example
+  template:
+    metadata:
+      labels:
+        app: example
+    spec:
+      containers:
+        - name: mc
+          image: itzg/minecraft-server
+          env:
+            - name: EULA
+              value: "TRUE"
+          volumeMounts:
+            - mountPath: /data
+              name: data
+  volumeClaimTemplates:
+    - metadata:
+        name: data
+      spec:
+        accessModes:
+          - ReadWriteOnce
+        resources:
+          requests:
+            storage: 1Gi
+---
+apiVersion: v1
+kind: Service
+metadata:
+  labels:
+    service: example
+  name: example
+spec:
+  ports:
+    - port: 25565
+      targetPort: 25565
+  selector:
+    app: example
+  type: LoadBalancer

examples/k8s/vanilla-deployment.yml

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+apiVersion: v1
+kind: Service
+metadata:
+  name: mc-vanilla
+spec:
+  type: NodePort
+  ports:
+  - port: 25565
+    nodePort: 30000
+  selector:
+    app: mc-vanilla
+---
+apiVersion: apps/v1
+kind: Deployment
+metadata:
+  name: mc-vanilla
+spec:
+  selector:
+    matchLabels:
+      app: mc-vanilla
+  template:
+    metadata:
+      labels:
+        app: mc-vanilla
+    spec:
+      containers:
+      - image: itzg/minecraft-server
+        name: mc-vanilla
+        env:
+          # Use secret in real usage
+        - name: EULA
+          value: "true"
+        ports:
+        - containerPort: 25565
+          name: main
+        readinessProbe:
+          exec:
+            command:
+            - mcstatus
+            - localhost
+            - ping
+          initialDelaySeconds: 5
+          periodSeconds: 5
+        livenessProbe:
+          exec:
+            command:
+            - mcstatus
+            - localhost
+            - ping
+          initialDelaySeconds: 5
+          periodSeconds: 5
+        volumeMounts:
+        - name: mc-data
+          mountPath: /data
+      volumes:
+      - name: mc-data
+        emptyDir: {}