qm-clone: add page (#9038)

pages/linux/qm-clone.md

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+# qm clone
+
+> Create a copy of virtual machine on QEMU/KVM Virtual Machine Manager.
+> More information: <https://pve.proxmox.com/pve-docs/qm.1.html>.
+
+- Copy a virtual machine:
+
+`qm copy {{vm_id}} {{new_vm_id}}`
+
+- Copy a virtual machine using a specific name:
+
+`qm copy {{vm_id}} {{new_vm_id}} --name {{name}}`
+
+- Copy a virtual machine using a specific descriptionn:
+
+`qm copy {{vm_id}} {{new_vm_id}} --description {{description}}`
+
+- Copy a virtual machine creating a full copy of all disks:
+
+`qm copy {{vm_id}} {{new_vm_id}} --full`
+
+- Copy a virtual machine using a specific format for file storage (requires `--full`):
+
+`qm copy {{vm_id}} {{new_vm_id}} --full --format {{qcow2|raw|vmdk}}`
+
+- Copy a virtual machine then add it to a specific pool:
+
+`qm copy {{vm_id}} {{new_vm_id}} --pool {{pool_name}}`