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/gcp/gcp-vm-instance-stop-by-label/engine.yaml

@@ -0,0 +1,46 @@
+apiVersion: litmuschaos.io/v1alpha1
+kind: ChaosEngine
+metadata:
+  name: gcp-vm-chaos
+spec:
+  # It can be active/stop
+  engineState: 'active'
+  chaosServiceAccount: gcp-vm-instance-stop-by-label-sa
+  # It can be delete/retain
+  experiments:
+    - name: gcp-vm-instance-stop-by-label
+      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: '30'
+            
+            - name: SEQUENCE
+              value: 'parallel'
+
+            # GCP project ID to which the vm instances belong
+            - name: GCP_PROJECT_ID
+              value: ''
+
+            # Label of the target vm instance(s)  
+            - name: INSTANCE_LABEL
+              value: ''
+
+            # Zone in which the target vm instance(s) filtered by the label exist
+            # all the instances should lie in a single zone
+            - name: INSTANCE_ZONES
+              value: ''
+
+            # enable it if the target instances are a part of a managed instance group
+            - name: MANAGED_INSTANCE_GROUP
+              value: 'disable'
+
+            # set the percentage value of the instances with the given label 
+            # which should be targeted as part of the chaos injection
+            - name: INSTANCE_AFFECTED_PERC
+              value: ''