docs: add snapshot and warmpool reference YAMLs

Author: syscod3

examples/snapshot/kustomization.yaml

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+apiVersion: kustomize.config.k8s.io/v1beta1
+kind: Kustomization
+resources:
+  - snapshot.yaml

examples/snapshot/snapshot.yaml

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+# Example: one-shot ImpVMSnapshot with node-local storage and 3-execution retention.
+# Prerequisites: a running ImpVM named "my-vm" in namespace "default".
+# After applying, watch: kubectl get impvmsnapshot -n default -w
+# Elect a base: kubectl imp elect my-snap <child-name>
+apiVersion: imp.dev/v1alpha1
+kind: ImpVMSnapshot
+metadata:
+  name: my-snap
+  namespace: default
+spec:
+  sourceVMName: my-vm
+  sourceVMNamespace: default
+  storage:
+    type: node-local
+    nodeLocal:
+      path: /var/lib/imp/snapshots
+  retention: 3

examples/warmpool/kustomization.yaml

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+apiVersion: kustomize.config.k8s.io/v1beta1
+kind: Kustomization
+resources:
+  - warmpool.yaml

examples/warmpool/warmpool.yaml

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+# Example: ImpWarmPool keeping 3 pre-booted VMs from an elected snapshot.
+# Prerequisites:
+#   - ImpVMSnapshot "my-snap" with a baseSnapshot elected
+#   - ImpVMTemplate "standard-runner" in namespace "default"
+# After applying, watch: kubectl get impwarmpool -n default -w
+apiVersion: imp.dev/v1alpha1
+kind: ImpWarmPool
+metadata:
+  name: fast-pool
+  namespace: default
+spec:
+  snapshotRef: my-snap
+  templateName: standard-runner
+  size: 3
+  expireAfter: 1h