(feat): Adding coredns experiment charts (#82)

* adding coredns pod delete experiment chart

Signed-off-by: Raj <raj.das@mayadata.io>

charts/coredns/coredns-pod-delete/coredns-pod-delete.chartserviceversion.yaml

@@ -0,0 +1,40 @@
+apiVersion: litmuchaos.io/v1alpha1
+kind: ChartServiceVersion
+metadata:
+  name: coredns-pod-delete
+  version: 0.1.0
+  annotations:
+    categories: CoreDNS
+    vendor: CNCF
+    createdAt: 2019-12-27T10:28:08Z
+    support: https://slack.cncf.io/
+spec:
+  displayName: coredns-pod-delete
+  categoryDescription: |
+    Pod delete contains chaos to disrupt state of coredns resources. Experiments can inject random pod delete failures against specified application.
+    - Causes (forced/graceful) pod failure of coredns replicas of an application deployment.
+    - Tests of successful resolution of app services during chaos injection
+  keywords:
+    - Kubernetes
+    - CoreDNS
+    - Pod delete 
+  platforms:
+    - GKE
+    - Minikube
+  maturity: alpha
+  maintainers:
+    - name: Raj Babu Das
+      email: raj.das@mayadata.io
+  minKubeVersion: 1.12.0
+  provider:
+    name: Mayadata
+  links:
+    - name: CoreDNS Website
+      url: https://coredns.io
+    - name: Source Code
+      url: https://github.com/coredns/coredns
+    - name: CoreDNS Slack
+      url: https://slack.cncf.io/
+    - name: Documentation
+      url: https://coredns.io/manual/toc/
+  chaosexpcrdlink: https://raw.githubusercontent.com/litmuchaos/chaos-charts/master/charts/coredns/coredns-pod-delete/experiment.yaml

charts/coredns/coredns-pod-delete/experiment.yaml

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+apiVersion: litmuschaos.io/v1alpha1
+description:
+  message: |
+    Deletes coredns pod in kube-system namespace
+kind: ChaosExperiment
+metadata:
+  name: coredns-pod-delete
+  version: 0.1.0
+spec:
+  definition:
+    permissions:
+      apiGroups:
+        - ""
+        - "extensions"
+        - "apps"
+        - "batch"
+        - "litmuschaos.io"
+      resources:
+        - "daemonsets"
+        - "jobs"
+        - "pods"
+        - "chaosengines"
+        - "chaosexperiments"
+        - "chaosresults"
+      verbs:
+        - "*"
+    image: "litmuschaos/ansible-runner:ci"
+    args:
+    - -c
+    - ansible-playbook ./experiments/coredns/pod_delete/pod_delete_ansible_logic.yml -i /etc/ansible/hosts -vv; exit 0
+    command:
+    - /bin/bash
+    env:
+
+    - name: ANSIBLE_STDOUT_CALLBACK
+      value: 'default'
+
+    - name: TOTAL_CHAOS_DURATION
+      value: '15'
+
+    - name: FORCE
+      value: 'true'
+
+    - name: CHAOS_INTERVAL
+      value: '5'
+
+    - name: LIB
+      value: ''    
+    labels:
+      name: coredns-pod-delete