Directory restructure to add scenarios and experiments (#559)

* Updated dir struture with scenarios and experiments dir

Signed-off-by: Amit Kumar Das <amit.das@harness.io>

* Added icons

Signed-off-by: Amit Kumar Das <amit.das@harness.io>

experiments/generic/node-io-stress/engine.yaml

@@ -0,0 +1,39 @@
+apiVersion: litmuschaos.io/v1alpha1
+kind: ChaosEngine
+metadata:
+  name: nginx-chaos
+  namespace: default
+spec:
+  # It can be active/stop
+  engineState: 'active'
+  #ex. values: ns1:name=percona,ns2:run=nginx 
+  auxiliaryAppInfo: ''
+  chaosServiceAccount: node-io-stress-sa
+  experiments:
+    - name: node-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'
+
+            ## Number of core of CPU
+            - name: CPU
+              value: '1'
+
+            ## Total number of workers default value is 4
+            - name: NUMBER_OF_WORKERS
+              value: '4'                               
+            
+             ## percentage of total nodes to target
+            - name: NODES_AFFECTED_PERC
+              value: ''
+
+            # provide the comma separated target node names
+            - name: TARGET_NODES
+              value: ''