Add run descheduler as deployment files and update README

kubernetes/deployment/deployment.yaml

@@ -0,0 +1,54 @@
+apiVersion: apps/v1
+kind: Deployment
+metadata:
+  name: descheduler
+  namespace: kube-system
+  labels:
+    app: descheduler
+spec:
+    replicas: 1
+    selector:
+      matchLabels:
+        app: descheduler
+    template:
+      metadata:
+        labels:
+          app: descheduler
+      spec:
+        priorityClassName: system-cluster-critical
+        serviceAccountName: descheduler-sa
+        containers:
+          - name: descheduler
+            image: k8s.gcr.io/descheduler/descheduler:v0.21.0
+            imagePullPolicy: IfNotPresent
+            command:
+              - "/bin/descheduler"
+            args:
+              - "--policy-config-file"
+              - "/policy-dir/policy.yaml"
+              - "--descheduling-interval"
+              - "5m"
+              - "--v"
+              - "3"
+            ports:
+            - containerPort: 10258
+              protocol: TCP
+            resources:
+              requests:
+                cpu: 500m
+                memory: 256Mi
+            securityContext:
+              allowPrivilegeEscalation: false
+              capabilities:
+                drop:
+                  - ALL
+              privileged: false
+              readOnlyRootFilesystem: true
+              runAsNonRoot: true
+            volumeMounts:
+              - mountPath: /policy-dir
+                name: policy-volume
+        volumes:
+        - name: policy-volume
+          configMap:
+            name: descheduler-policy-configmap

kubernetes/deployment/kustomization.yaml

@@ -0,0 +1,6 @@
+apiVersion: kustomize.config.k8s.io/v1beta1
+kind: Kustomization
+
+resources:
+  - ../base
+  - deployment.yaml