Enhance deployment instructions in README (#123)

Updated deployment instructions for NGINX Declarative API to include Helm chart.

Signed-off-by: 65397 <fiorucci@oasi.asti.it>

Author: fabriziofiorucci

README.md

@@ -221,7 +221,11 @@ A sample Postman collection and usage instructions can be found [here](/contrib/
 
 ## 🏃 How to run
 
-NGINX Declarative API can be deployed on a Linux virtual machine using [docker-compose](/contrib/docker-compose) or on [Kubernetes](/contrib/kubernetes)
+NGINX Declarative API can be deployed on:
+
+* Linux virtual machine using [docker-compose](/contrib/docker-compose)
+* Kubernetes using [manifests](/contrib/kubernetes)
+* Kubernetes using a [Helm chart](contrib/helm/nginx-declarative-api)
 
 ## 🐳 Building Docker images