add source code and readme

manifests/infrastructure/longhorn/backup-examples.yaml

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+# Examples of how to apply S3 backup recurring jobs to volumes
+# These are examples - you would apply these patterns to your actual PVCs/StorageClasses
+
+---
+# Example 1: Apply backup labels to an existing PVC
+# This requires the PVC to be labeled as a recurring job source first
+apiVersion: v1
+kind: PersistentVolumeClaim
+metadata:
+  name: example-app-data
+  namespace: default
+  labels:
+    # Enable this PVC as a source for recurring job labels
+    recurring-job.longhorn.io/source: "enabled"
+    # Apply daily backup job group
+    recurring-job-group.longhorn.io/longhorn-s3-backup: "enabled"
+    # OR apply weekly backup job group (choose one)
+    # recurring-job-group.longhorn.io/longhorn-s3-backup-weekly: "enabled"
+    # OR apply specific recurring job by name
+    # recurring-job.longhorn.io/s3-backup-daily: "enabled"
+spec:
+  accessModes:
+    - ReadWriteOnce
+  resources:
+    requests:
+      storage: 10Gi
+  storageClassName: longhorn
+
+---
+# Example 2: StorageClass with automatic backup assignment
+# Any PVC created with this StorageClass will automatically get backups
+apiVersion: storage.k8s.io/v1
+kind: StorageClass
+metadata:
+  name: longhorn-backup-daily
+provisioner: driver.longhorn.io
+allowVolumeExpansion: true
+reclaimPolicy: Retain
+volumeBindingMode: Immediate
+parameters:
+  numberOfReplicas: "2"
+  staleReplicaTimeout: "30"
+  fromBackup: ""
+  # Automatically assign backup jobs to volumes created with this StorageClass
+  recurringJobSelector: |
+    [
+      {
+        "name":"longhorn-s3-backup",
+        "isGroup":true
+      }
+    ]
+
+---
+# Example 3: StorageClass for critical data with both daily and weekly backups
+apiVersion: storage.k8s.io/v1
+kind: StorageClass
+metadata:
+  name: longhorn-backup-critical
+provisioner: driver.longhorn.io
+allowVolumeExpansion: true
+reclaimPolicy: Retain
+volumeBindingMode: Immediate
+parameters:
+  numberOfReplicas: "2"
+  staleReplicaTimeout: "30"
+  fromBackup: ""
+  # Assign both daily and weekly backup groups
+  recurringJobSelector: |
+    [
+      {
+        "name":"longhorn-s3-backup",
+        "isGroup":true
+      },
+      {
+        "name":"longhorn-s3-backup-weekly", 
+        "isGroup":true
+      }
+    ]