Add clusterctl-settings.json (kubernetes-sigs#504)

per https://master.cluster-api.sigs.k8s.io/clusterctl/developers.html
Each provider must have a clusterctl-settings.json
file describing how to build the provider assets.

currently using v0.2.0 and follow on we might need moidfy the value

Author: jichenjc

clusterctl-settings.json

@@ -0,0 +1,8 @@
+{
+  "name": "openstack",
+  "config": {
+    "componentsFile": "infrastructure-components.yaml",
+    "nextVersion": "v0.2.0",
+    "type": "InfrastructureProvider"
+  }
+}