chore: add readme for demo istio

demo/istio/README.md

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+# Istio Demo 
+
+This Istio Demo is prototype of the kyverno envoy plugin .
+
+## Overview 
+
+The goal of the demo to show user how kyverno-envoy-plugin will work with istio and how it can be used to enforce policies to the traffic between services. The Kyverno-envoy-plugin allows configuring these Envoy proxies to query Kyverno-json for policy decisions on incoming requests.
+
+## Contains
+
+- A manifests folder with everything we need to run the demo . 
+- bootstrap.sh creates the cluster and installs istio . 
+
+## Architecture
+The below architecture illustrates a scenario where no service mesh or Envoy-like components have been pre-installed or already installed.
+
+![Architecture](architecture1.png)
+
+
+The below architecture illustrates a scenario where a service mesh or Envoy-like components have been pre-installed or already installed.
+![Architecture](architecture2.png)
+
+## Requirements
+
+- Istio Authorizationpolicy manifest  to add "extension provider " concept in MeshConfig to specify Where/how to talk to envoy ext-authz service 
+-
+-