Update README.md

Author: kumarabd

lab-3/README.md

@@ -93,11 +93,71 @@ Docker Desktop users please use `http://localhost/productpage` to access product
 
 Before we start playing with Istio's traffic management capabilities we need to define the available versions of the deployed services. They are called subsets, in destination rules.
 
-Using Meshery, navigate to the Istio management page, and:
-
-1. Enter `default` in the `Namespace` field.
-1. Click the (+) icon on the `Configure` card and select `Default BookInfo destination rules (defines subsets)` from the list.
-
+Using Meshery, navigate to the Custom yaml page, and apply the below to create the subsets for BookInfo:
+
+```sh
+apiVersion: networking.istio.io/v1alpha3
+kind: DestinationRule
+metadata:
+  name: productpage
+spec:
+  host: productpage
+  subsets:
+    - name: v1
+      labels:
+        version: v1
+---
+apiVersion: networking.istio.io/v1alpha3
+kind: DestinationRule
+metadata:
+  name: reviews
+spec:
+  host: reviews
+  subsets:
+    - name: v1
+      labels:
+        version: v1
+    - name: v2
+      labels:
+        version: v2
+    - name: v3
+      labels:
+        version: v3
+---
+apiVersion: networking.istio.io/v1alpha3
+kind: DestinationRule
+metadata:
+  name: ratings
+spec:
+  host: ratings
+  subsets:
+    - name: v1
+      labels:
+        version: v1
+    - name: v2
+      labels:
+        version: v2
+    - name: v2-mysql
+      labels:
+        version: v2-mysql
+    - name: v2-mysql-vm
+      labels:
+        version: v2-mysql-vm
+---
+apiVersion: networking.istio.io/v1alpha3
+kind: DestinationRule
+metadata:
+  name: details
+spec:
+  host: details
+  subsets:
+    - name: v1
+      labels:
+        version: v1
+    - name: v2
+      labels:
+        version: v2
+```
 This creates destination rules for each of the BookInfo services and defines version subsets
 
 <small>Manual step for can be found [here](#appendix)</small>