feat(node-taint): Adding the node taint experiment (#258)

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

charts/generic/node-taint/engine.yaml

@@ -0,0 +1,32 @@
+apiVersion: litmuschaos.io/v1alpha1
+kind: ChaosEngine
+metadata:
+  name: nginx-chaos
+  namespace: default
+spec:
+  # It can be true/false
+  annotationCheck: 'false'
+  # 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: node-taint-sa
+  monitoring: false
+  # It can be delete/retain
+  jobCleanUpPolicy: 'delete'
+  experiments:
+    - name: node-taint
+      spec:
+        components:
+          env:
+            # set node name
+            - name: APP_NODE
+              value: 'node-1'
+             # set taint label & effect
+             # key=value:effect or key:effect
+            - name: TAINTS
+              value: 'node.kubernetes.io/unreachable:NoExecute'