Add new file

Openstack/pv176_student_server_group.yaml

+heat_template_version: 2016-04-08
+
+description: >
+  Small cluster of VMs which uses git templates. (dont forget to use environment file)
+parameters:
+
+  cluster_size:
+    type: number
+    label: Cluster size
+    description: Number of instances in cluster.
+    default: 4
+
+resources:
+  tiny_cluster:
+    type: OS::Heat::ResourceGroup
+    properties:
+      count: { get_param: cluster_size }
+      resource_def:
+        type: Lib::single_vm
+        properties:
+          network: { get_attr: [ network, private_subnet, network_id ] }
+
+ 
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