Add inventory example in yaml

inventory_example.yml

@@ -0,0 +1,28 @@
+all:
+  children:
+      promox-kvm:
+        hosts:
+          192.168.122.10:
+            hostname: proxy
+            vm_id: 100
+            os: archlinux
+            filesystem: btrfs
+            vm_memory: "2048"
+            vm_ballo: "1024"
+            vm_cpus: "2"
+            vm_size: "5"
+            vm_nif: vmbr1
+            vm_gw: 192.168.122.1
+            vm_dns: 1.1.1.1
+          192.168.122.11:
+            hostname: database
+            vm_id: 101
+            os: archlinux
+            filesystem: btrfs
+            vm_memory: "6144"
+            vm_ballo: "3072"
+            vm_cpus: "4"
+            vm_size: "40"
+            vm_nif: vmbr1
+            vm_gw: 192.168.122.1
+            vm_dns: 1.1.1.1