chore(new_chart): Add chart for pod IO stress charts (#320)

* chore(new_chart): Add chart for pod io stress charts

Signed-off-by: Udit Gaurav <udit.gaurav@mayadata.io>

charts/generic/pod-io-stress/engine.yaml

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+apiVersion: litmuschaos.io/v1alpha1
+kind: ChaosEngine
+metadata:
+  name: nginx-chaos
+  namespace: default
+spec:
+  # It can be true/false
+  annotationCheck: 'true'
+  # It can be active/stop
+  engineState: 'active'
+  #ex. values: ns1:name=percona,ns2:run=nginx 
+  auxiliaryAppInfo: ''
+  appinfo:
+    appns: 'default'
+    applabel: 'app=nginx'
+    appkind: 'deployment'
+  chaosServiceAccount: pod-io-stress-sa
+  monitoring: false
+  # It can be delete/retain
+  jobCleanUpPolicy: 'delete'
+  experiments:
+    - name: pod-io-stress
+      spec:
+        components:
+          env:
+            # set chaos duration (in sec) as desired
+            - name: TOTAL_CHAOS_DURATION
+              value: '120'
+
+            ## specify the size as percentage of free space on the file system
+            - name: FILESYSTEM_UTILIZATION_PERCENTAGE
+              value: '10'
+
+            - name: TARGET_POD
+              value: ''

charts/generic/pod-io-stress/experiment.yaml

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+---
+apiVersion: litmuschaos.io/v1alpha1
+description:
+  message: |
+    IO stress on a app pods belonging to an app deployment
+kind: ChaosExperiment
+metadata:
+  name: pod-io-stress
+spec:
+  definition:
+    scope: Namespaced
+    permissions:
+      - apiGroups:
+          - ""
+          - "batch"
+          - "litmuschaos.io"
+        resources:
+          - "jobs"
+          - "pods"
+          - "pods/log"
+          - "events"
+          - "chaosengines"
+          - "chaosexperiments"
+          - "chaosresults"
+        verbs:
+          - "create"
+          - "list"
+          - "get"
+          - "patch"
+          - "update"
+          - "delete"
+    image: "litmuschaos/go-runner:latest"
+    args:
+    - -c
+    - ./experiments/pod-io-stress
+    command:
+    - /bin/bash
+    env:
+      - name: TOTAL_CHAOS_DURATION
+      value: '120'
+
+      ## specify the size as percentage of free space on the file system
+      ## default value 90 (in percentage)
+      - name: FILESYSTEM_UTILIZATION_PERCENTAGE
+        value: '10'
+
+      ## we can specify the size in Gigabyte (Gb) also in place of percentage of free space
+      ## NOTE: for selecting this option FILESYSTEM_UTILIZATION_PERCENTAGE should be empty
+      - name: FILESYSTEM_UTILIZATION_BYTES
+        value: ''
+
+      ## Total number of workers default value is 4
+      - name: NUMBER_OF_WORKERS
+        value: '4'    
+
+      ## Percentage of total pods to target
+      - name: PODS_AFFECTED_PERC
+        value: ''        
+
+      # Period to wait before and after injection of chaos in sec
+      - name: RAMP_TIME
+        value: ''
+
+      # Provide the LIB here
+      # Only pumba supported
+      - name: LIB
+        value: 'pumba'
+
+      # provide lib image
+      - name: LIB_IMAGE
+        value: 'gaiaadm/pumba' 
+
+    labels:
+      name: pod-io-stress

charts/generic/pod-io-stress/pod-io-stress.chartserviceversion.yaml

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+apiVersion: litmuchaos.io/v1alpha1
+kind: ChartServiceVersion
+metadata:
+  createdAt: 2020-09-13T10:28:08Z
+  name: pod-io-stress
+  version: 0.1.0
+  annotations:
+    categories: Kubernetes
+    vendor: CNCF
+    support: https://slack.kubernetes.io/
+spec:
+  displayName: pod-io-stress
+  categoryDescription: |
+    This experiment causes disk stress on the application pod. The experiment aims to verify the resiliency of applications that share this disk resource for ephemeral or persistent storage purposes.    
+    - Consumes the disk available by executing filesystem IO stress as available memory or by providing the value in GB
+    - The application pod should be healthy once chaos is stopped. Expectation is that service-requests should be served despite chaos.
+  keywords:
+    - Kubernetes
+    - Memory
+  platforms:
+    - GKE
+    - Packet(Kubeadm)
+    - Minikube
+    - EKS
+  maturity: alpha
+  maintainers:
+    - name: Udit Gaurav
+      email: udit.gaurav@mayadata.io
+  minKubeVersion: 1.12.0
+  provider:
+    name: Mayadata
+  links:
+    - name: Source Code
+      url: https://github.com/litmuschaos/litmus-go/tree/master/experiments/generic/pod-io-stress
+    - name: Documentation
+      url: https://docs.litmuschaos.io/docs/pod-io-stress/
+    - name: Video
+      url:
+  icon:
+    - base64data: ""
+      mediatype: ""
+  chaosexpcrdlink: https://raw.githubusercontent.com/litmuschaos/chaos-charts/master/charts/generic/pod-io-stress/experiment.yaml 

charts/generic/pod-io-stress/rbac.yaml

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