Add helm chart usage example

Author: everesio

README.md

@@ -19,7 +19,7 @@ MQTT Proxy allows MQTT clients to send messages to other messaging systems
     * [ ] [Apache Pulsar](https://pulsar.apache.org/)
     * [ ] Others
 * [ ] Authentication
-* [ ] Helm chart
+* [x] Helm chart
 
 ## Build
 ### build binary
@@ -30,6 +30,20 @@ MQTT Proxy allows MQTT clients to send messages to other messaging systems
 
     make clean docker-build
 
+## Helm 3 chart
+
+Deploy the Helm chart
+
+```bash
+git clone [email protected]:grepplabs/mqtt-proxy.git
+helm install mqtt-proxy ./mqtt-proxy/charts/mqtt-proxy \
+  --set image.tag=latest \
+  --set image.repository=grepplabs/mqtt-proxy \
+  --values  <(echo '{
+        "extraArgs" : ["server","--mqtt.publisher.name=noop"]
+    }')
+```
+
 ## Test
 
 prerequisites