Create LIBVIRT_CLOUD_IMAGES.md

docs/LIBVIRT_CLOUD_IMAGES.md

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+# Libvirt cloud images
+
+```
+touch network-config
+touch meta-data
+cat >user-data <<EOF
+#cloud-config
+password: password
+chpasswd:
+  expire: False
+ssh_pwauth: True
+EOF
+```
+
+```
+wget https://cloud-images.ubuntu.com/jammy/current/jammy-server-cloudimg-amd64.img
+
+$ qemu-img info jammy-server-cloudimg-amd64.img 
+image: jammy-server-cloudimg-amd64.img
+file format: qcow2
+virtual size: 2.2 GiB (2361393152 bytes)
+disk size: 620 MiB
+cluster_size: 65536
+Format specific information:
+    compat: 0.10
+    compression type: zlib
+    refcount bits: 16
+```
+
+```
+virt-install \
+  --name cloud-init-001 \
+  --memory 4000 \
+  --noreboot \
+  --os-variant detect=on,name=ubuntujammy \
+  --disk=size=10,backing_store="$(pwd)/jammy-server-cloudimg-amd64.img" \
+  --cloud-init user-data="$(pwd)/user-data,meta-data=$(pwd)/meta-data,network-config=$(pwd)/network-config"
+```