docs: add details about the Istio integration

This adds links related to the Istio integration for gRPC-Web.

Signed-off-by: Venil Noronha <[email protected]>

README.md

@@ -296,6 +296,23 @@ You can also try this
 $ docker-compose -f advanced.yml up -d node-server grpcwebproxy binary-client
 ```
 
+## Integration with Istio
+
+[Istio](https://istio.io/) enables the `envoy.grpc_web` web filter for services
+with port names prefixed with `grpc-web`. See
+[this](https://github.com/istio/istio/pull/10064) pull request on Istio for more
+details.
+
+You can also find the necessary configuration to get a gRPC-Web project up and
+running on Istio in the
+[gRPC-Web - Istio Demo](https://github.com/venilnoronha/grpc-web-istio-demo)
+repository. The
+[talk](https://grpconf19.sched.com/event/L70z/seamless-cloud-native-apps-with-grpc-web-and-istio-venil-noronha-vmware)
+and the
+[blog post](https://venilnoronha.io/seamless-cloud-native-apps-with-grpc-web-and-istio)
+on **Seamless Cloud-Native Apps with gRPC-Web and Istio** also discuss the
+motivation and the methodology for using gRPC-Web with Istio.
+
 ## Acknowledgement
 
 Big thanks to the following contributors for making significant contributions to