Add Helm chart usage section to README

Added usage instructions for Helm chart installation.

Author: wlanboy

javahttpclient-chart/readme.md

@@ -1,3 +1,6 @@
+## Helm chart usage
+How to install the java based http client via helm.
+
 ```bash
 helm install httpclient . -n clients --create-namespace
 ```
@@ -13,4 +16,4 @@ helm upgrade httpclient . -n clients
 
 ```bash
 helm uninstall httpclient -n clients
-```
+```