Add openstack application credential allowed paths

Add k8s sample deployment

Author: frct1

.dockerignore

@@ -0,0 +1,3 @@
+.vscode/
+.github/
+kubernetes/

README.md

@@ -9,3 +9,21 @@ openstack_peepo_exporter_instances_per_hypervisor{hypervisor_id="98cdd331-8bea-4
 openstack_peepo_exporter_instances_per_hypervisor{hypervisor_id="9f9b83fe-78b1-470d-9c4a-4eb64fb5116d",hypervisor_name="compute-2"} 228.0
 openstack_peepo_exporter_instances_per_hypervisor{hypervisor_id="53785372-dedc-47fb-bd45-6d9e6518abac",hypervisor_name="compute-3"} 322.0
 ```
+
+## OpenStack's side applcation credential
+```yaml
+- service: placement
+  method: GET
+  path: /resource_providers
+
+- service: placement
+  method: GET
+  path: /resource_providers/{provider_id}/allocations
+```
+
+## Kubernetes deployment
+
+- Create secret from your `clouds.yaml`
+
+`# kubectl create secret generic openstack-clouds-yaml --from-file=clouds.yaml=clouds.yaml`
+

kubernetes/01-deployment.yaml

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+apiVersion: apps/v1
+kind: Deployment
+metadata:
+  name: openstack-peepo-exporter
+spec:
+  replicas: 1
+  selector:
+    matchLabels:
+      app: openstack-peepo-exporter
+  template:
+    metadata:
+      labels:
+        app: openstack-peepo-exporter
+    spec:
+      containers:
+        - name: openstack-peepo-exporter
+          image: openstack-peepo-exporter:latest
+          command: ["python"]
+          args: ["/app/src/main.py", "--cloud", "openstack"]
+          volumeMounts:
+            - name: openstack-config
+              mountPath: /etc/openstack/clouds.yaml
+              subPath: clouds.yaml
+              readOnly: true
+      volumes:
+        - name: openstack-config
+          secret:
+            secretName: openstack-clouds-yaml
+            items:
+              - key: clouds.yaml
+                path: clouds.yaml