chore: import upstream snapshot with attribution

cli-tool/components/skills/database/alloydb-basics/references/cli-usage.md

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+# AlloyDB CLI Usage
+
+AlloyDB resources are managed using the `gcloud alloydb` command group.
+
+## Clusters
+
+1. Create a cluster: `gcloud alloydb clusters create CLUSTER_ID --region=REGION
+   --password=PASSWORD`
+
+2. List clusters: `gcloud alloydb clusters list --region=REGION`
+
+3. Get cluster info: `gcloud alloydb clusters describe CLUSTER_ID
+   --region=REGION`
+
+4. Delete a cluster: `gcloud alloydb clusters delete CLUSTER_ID --region=REGION`
+
+## Instances
+
+1. Create a primary instance: `gcloud alloydb instances create INSTANCE_ID
+   --cluster=CLUSTER_ID --region=REGION --instance-type=PRIMARY --cpu-count=8`
+
+2. Create a read pool instance: `gcloud alloydb instances create INSTANCE_ID
+   --cluster=CLUSTER_ID --region=REGION --instance-type=READ_POOL
+   --read-pool-node-count=2 --cpu-count=2`
+
+3. List instances: `gcloud alloydb instances list --cluster=CLUSTER_ID
+   --region=REGION`
+
+4. Restart an instance: `gcloud alloydb instances restart INSTANCE_ID
+   --cluster=CLUSTER_ID --region=REGION`
+
+## Backups
+
+1. Create a backup: `gcloud alloydb backups create BACKUP_ID
+   --cluster=CLUSTER_ID --region=REGION`
+
+2. List backups: `gcloud alloydb backups list --region=REGION`