chore(pod-delete): Adding engine & rbac for getstarted guide (#315)

Signed-off-by: shubhamchaudhary <shubham.chaudhary@mayadata.io>

charts/generic/pod-delete/engine_nginx_getstarted.yaml

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+apiVersion: litmuschaos.io/v1alpha1
+kind: ChaosEngine
+metadata:
+  name: nginx-chaos
+  namespace: nginx
+spec:
+  appinfo:
+    appns: 'nginx'
+    applabel: 'app=nginx'
+    appkind: 'deployment'
+  # It can be true/false
+  annotationCheck: 'true'
+  # It can be active/stop
+  engineState: 'active'
+  #ex. values: ns1:name=percona,ns2:run=nginx
+  auxiliaryAppInfo: ''
+  chaosServiceAccount: pod-delete-sa
+  monitoring: false
+  # It can be delete/retain
+  jobCleanUpPolicy: 'delete'
+  experiments:
+    - name: pod-delete
+      spec:
+        components:
+          env:
+            # set chaos duration (in sec) as desired
+            - name: TOTAL_CHAOS_DURATION
+              value: '30'
+
+            # set chaos interval (in sec) as desired
+            - name: CHAOS_INTERVAL
+              value: '10'
+              
+            # pod failures without '--force' & default terminationGracePeriodSeconds
+            - name: FORCE
+              value: 'false'

charts/generic/pod-delete/rbac_nginx_getstarted.yaml

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+---
+apiVersion: v1
+kind: ServiceAccount
+metadata:
+  name: pod-delete-sa
+  namespace: nginx
+  labels:
+    name: pod-delete-sa
+---
+apiVersion: rbac.authorization.k8s.io/v1beta1
+kind: Role
+metadata:
+  name: pod-delete-sa
+  namespace: nginx
+  labels:
+    name: pod-delete-sa
+rules:
+- apiGroups: ["","litmuschaos.io","batch","apps"]
+  resources: ["pods","deployments","pods/log","events","jobs","chaosengines","chaosexperiments","chaosresults"]
+  verbs: ["create","list","get","patch","update","delete"]
+---
+apiVersion: rbac.authorization.k8s.io/v1beta1
+kind: RoleBinding
+metadata:
+  name: pod-delete-sa
+  namespace: nginx
+  labels:
+    name: pod-delete-sa
+roleRef:
+  apiGroup: rbac.authorization.k8s.io
+  kind: Role
+  name: pod-delete-sa
+subjects:
+- kind: ServiceAccount
+  name: pod-delete-sa
+  namespace: nginx